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PRINCIPLES OF SCIENTIFIC BOTANY;

Or, BOTANY AS AN INDUCTIVE SCIENCE.

Translated by Dr. LANKESTER. Hundreds of Woodcuts, and 6 pages of Figures beautifully engraved on Steel.

Demy 8vo. price 108. 6d. Every Botanical Library should possess this work, as it contains the principles upon which all

structural botany is based.

London : ROBERT HARDWICKE, 192 Piccadilly, W.

SECOND-HAND MICROSCOPES,

TELESCOPES, RACE, FIELD, AND OPERA GLASSES,

CAMERAS AND LENSES,

THEODOLITES, LEVELS, MAGIC and DISSOLVING VIEW LANTERNS and SLIDES,

AND EVERY DESCRIPTION OF SURGICAL, MATHEMATICAL, PHILOSOPHICAL, AND OTHER

INSTRUMENTS.

WILLIAM LAWLEYS, 78 FARRINGDON STREET, CITY, SEPARATE CATALOGUES FORWARDED ON RECEIPT OF THREE STAMPS EACH.

Enlarged Illustrated Surgical Catalogue, Six Stamps. N.B.-GOOD INSTRUMENTS PURCHASED OR TAKEN IN EXCHANGE.

HENRY CROUCH, 31 LONDON WALL, LONDON, E.C.

REVISED PRICE-LIST OF OBJECTIVES.

The Obiertives comprised in the following Lists are guaranteed of the highest class, and especial attention direital to the new IMMERSIOX f-in., unsurpassed for brilliance and definition, and working through the thickest Orering glass. The new IMMERSION, -in. 140°, with screw adjustment for thickness of cover, £4. 10s. :

with extra dry front, £5. 10s. £ s. d.

£ s. d.
in.
1

£
9°....
0 0

s. d.
1-in. 25°
.... 1 10 0 2-in, 100°..

3 0 0 . 1 100 1-in. 16° ..... 100 -in. 75o..

2 2 0 -in. 15°...

...........
. 1 100
4-in, 30°
1 10 0 -in. 1000..

3 0 0 -in. 12°.. .. 1 0 0 1-in. 40° .............. 2 5 0 1 in. 140°....

4 100 -in. 20° i 100 f-in. 90° ..

... 3 15 0

Post-Office Orders to be made payable at Lombard Street, with 6d. extra for postage.

WHITE'S MOC-MAIN LEVER TRUSS,

Perfected and Exhibited in the Great Exhibitions, 1851 & 1862,
TS allowed by upwards of 500 Medical Gentlemen to be the most effective invention in the curso
1 tive treatment of HERNIA. The use of a steel spring, so often hurtful in its effects, is here
avoided : a soft bandage being worn round the body, while the requisite resisting power
supplied by the MOC-MAIN PAD AND PATENT LEVER, fitting with so much ease and
closeness that it cannot be detected, and may be worn during sleep. A descriptive circular may
be had, and the Truss (which cannot fail to fit) forwarded by post, on the circumference of the
body (two inches below the hips) being sent to the
Manufacturer, Mr. WHITE, 228 Piccadilly, London,

Price of a Single Truss, 168., 21s., 26s. 6d., and 31s. 6d.-Postage, 3d.
Price of a Double Truss, 318. 6d., 428., and 528. 6d.-Postage, 4d.

Price of Umbilical Truss, 42s, and 528. 60.-Postage, 4d.
Post-office Orders to be made payable to JOHN WHITE, Post Office, Piccadilly.

NEW PATENT
ELASTIC STOCKINGS, KNEE-CAPS, &c.
For VARICOSE VEINS, and all cases of WEAKNESS and SWELLING of the LEGS, SPRAINS, &c. The
are porous, light in texture, and inexpensive, and are drawn on like an ordinary stocking.

Price 4s. 6d., 7s. 6d., 108., and 16s, each.-Postage, 2d.
Manufacturer, JOHN WHITE, 228 Piccadilly, London, W.

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SYNOPSIS FILICUM ; INCLUDING OSMUNDACEÆ, SCHIZÆACEÆ MARATTIACEÆ, AND OPHIOGLOSSACEÆ,

Accompanied by Figures representing the essential characteristics of each Genus. By the late Sir W. J. HOOKER, K.H., and JOHN GILBERT BAKER, F.L.S., Assistant-Curatar

of the Kew Gardens. This is the cheapest and most complete book which describes all the Ferns throughout the world. So full and clear are i details that anybody who will take the trouble to master a few botanical terms can with certainty name any fern he may with in any part of the world, whether growing wild or under cultivation in garden or hothouse.

Sir W. Hooker began collecting a Fern Herbarium in 1811. For this study this enthusiastic and illustrious botanist hall his lite extraordinary advantages. The positions he occupied first Professor of Botany at Glasgow, and then as Director of Kew Gardens-were made the most ot, not merely by amability of character which made his pupils and friends willing a ants, but at Kew he possessed the finest herbarium of ferns, and, thanks to Mr. John Sinith, the best collection of fert: Cultivation in the world. The names of travellers and botanists to whom he acknowledges obligations fill a page and sta" his preface. When Sir W. Ilooker died, his son, Dr. Iloker, requested r. J. G. Baker to curry it out, possessing as he did! access to the specimens, and beink supplied with Sir William's Aotes and annotations. The result is the publication of Di Work us the author designeda tule mecum for the students, cultivators, and collectors of ferns.'-ATHENAM.

London : ROBERT HARDWICKE, 192 Piccadilly, W.

Fcp. 8vo. price 2s. 6d. plain, 4s. coloured, HALF-HOURS WITH THE MICROSCOPE.

By EDWIN LANKESTER, M.D. Illustrated by 250 Drawings from Nature by TUFFEN WEST. New Edition, much enlarged, w

full Description of the rarious Parts of the Instrument.

Fep. 8vo. cloth, with Illustrations on Stone and Wood, price 2s. 6d.
HALF-HOURS WITH THE TELESCOPE.
Being a Popular Guide to the Use of the Telescope as a means of Amusement and Instruct

Adapted to inexpensive Instruments.
By R. A. PROCTOR, B.A., F.R.A.S.

Demy 4to. cloth, price 5s. HALF-HOURS WITH THE STARS. A PLAIN AND EASY GUIDE TO THE KNOWLEDGE OF THE CONSTELLATION Showing in Twelve Maps the Position of the principal Star-Groups night after night throug! the Year. With Introduction, and a separate Explanation of each Map. True for erery Yr

By R. A. PROCTOR, B.A., F.R.A.S., Author of Half-Hours with the Telescope."

London : ROBERT HARDWICKE, 192 Piccadilly, W.

ACHROMATIC MICROSCOPES, APPARATUS, AND MATERIALS.

THE CHEAPEST AND MOST PERFECT ARE TO BE OBTAINED AT

C. BAKER'S,
244 & 245 HIGH HOLBORN.

A SUPERIOR BINOCULAR MICROSCOPE, with Rack Adjustment and Slow Motion

£6 10 0 The IMPROVED EDUCATIONAL MICROSCOPE, with 3 Superior Achromatic Powers and Apparatus, in lahogany Caso 2880 The IMPROVED STUDENT'S NICROSCOPE, with new Concentric Stage, having Motions in opposite directions .

O PORTABLE TRAVELLING or SEASIDE MICROSCOPE . . . . . . . . . . 29 100

APPARATUS AND MATERIALS OF ALL KINDS AT THE LOWEST PRICES. The Largest Assortment of Objects in London can be selected from at 1s. each, including a beautiful collection of

MULLER'S DIATOMS just received. C. BAKER having accepted the Agency of Mr. Gundlach, of Berlin, is now enabled to supply his celebrated Immersion and other Object Glasses

at very Moderate Prices.
New Illustrated Catalogues free by post. Established 1766.

MAGIC LANTERNS AND DISSOLVING VIEWS.

The Cheapest and Best House in London for Phantasmagoria Lanterns and Dissolving Vieus is

C. BAKER'S, 244 & 245 HIGH HOLBORN.
A first-class Set of DISSOLVING VIEW APPARATUS. completo, that will all a disc 10 feet

in diameter, £6. jos.
MAGIC LANTERNS, with 3; inch Lenses, giving a disc of 10 feet .. Le 108. Od.
DITTO
with 3 inch

ditto

ditto

. . 21 178. Od. A large assortment of smaller sizes, with slides, from 6s, 6d. FIRST-CLASS OXY HYDROGEN AND OXYCALCIUM APPARATUS EQUALLY CHEAP. Also a very extensive collection of BEAUTIFULLY PAINTED SLIDES, from 1s. 6d. each.

Instantaneous and other Photographs, from 28. each. A Collection of Dissolving Views and Lanterns specially kept for Hire at reduced prices.

CATALOGUES FREE BY POST. ESTABLISHED 1765.

J. SWIFT, Microscope Maker and Practical Optician.

FOUR GOLD MEDALS AWARDED.

MANY YEARS WITH THE LATE A. ROSS. REDUCED PRICE LIST OF OBJECTIVES (All of which will stand the deepest Eye-piece Power), for Flatness of Field and Penetration unsurpassed. £ s. d. 1 £ . d.

£ s. d. 4-in. 99.............. .. 1 0 0 1-in. 25°

.. 1 100
1-in. 100°.....

3 0 0 3-in. 12° .............. 1 10 0 1.in. 16°

....... 10 0
i-in. 75o.

2 2 0 2-in. 15° . 1 10 0 -in. 300 ....... 1 10 0 L

. 3 0 0 2-in. 1:20... .. 100 h-in, 40% ....... 2 5 0 -in. 140°..

4 100 11.in. 20°........ ... 1 100 -in. 90°

... 3 15 0 Swift's New Immersion Objective, with Adjustment, complete, in Box

£5 0 0 Dry Front, if required, extra ..........

£2 0 0 Illustrated Catalogue of Microscopes and Accessories, containing an extensive List of Objectives,

free for stamp.

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43 UNIVERSITY STREET, TOTTENHAM COURT ROAD, LONDON, W.C.

MURRAY & HEATH'S IMPROVED MAGIC LANTERN & DISSOLVING

VIEW APPARATUS.
A Great Variety of the Best Painted Slides, Photographs of British and

other Scenery, &c. &c. &c.
PRICE LIST FORWARDED FOR ONE PENNY STAMP.:

MURRAY & HEATH, Opticians &c. to Her Majesty and the Government Departments,

69 JERMYN STREET, LONDON, S.W.

SEVENTH EDITION, NOW READY.

Dedicated by express permission to His Royal Highness

THE PRINCE OF WALES.

Dedicated by express permision to His Royal Highness THE COUNTY FAMILIES

UNITED KINGDOM;

OF THE

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EDITED BY
E. WALFORD, M.A.
LATE SCHOLAR OF BALLIOL COLLEGE, OXFORD.

Containing All the Untitled as well as all the Titled All those who bear Courtesy Titles or

Aristocracy of England, Ireland, Scot- hold official or other County Positions. land, and Wales.

All the Lord-Lieutenants. All the Dukes, Marquises, Earls, Vis. All the Deputy Lieutenants. counts, and Barons.

All the High Sheriffs. All the Baronets.

All those who from Birth or Position are All the Knights.

entitled to rank as County Families.'

The County Families gives a brief notice of the Descent, Birth, Marriage, Education, and Appointment of each person ; his Heir (apparent or presumptive); the Patronage at his disposal; a Record of the Offices which he has held; together with his Town Address and Country Residences.

All the information is compiled from materials collected from the Families themselves, and overy exertion is used to render the Work thoroughly accurate and reliable. In One Splendid Volume, 11,000 Families, over 1,000 pages super-royal, beautifully bound,

gilt edges, price £2 108.

London : ROBERT HARDWICKE, 192 Piccadilly, W.

THE SHILLING PEERAGE, 1871.

THE SHILLING BARONETAGE, 1871.

THE SHILLING KNIGHTAGE, 1871.

THE SHILLING HOUSE OF COMMONS, 1871.

LONDON: ROBERT HARDWICKE, 192 Piccadilly, w.

PUBLISHED MONTHLY, PRICE 4d.

HARDWICKE'S SCIENCE GOSSIP.

No. 83. JANUARY 1872,

CONTAINS:
SCIENCE IN THE TENTH AND TWELFTH CEN- | New SPECIES OF Rotatoria. By F. Collins,
TURIES. By F. Kitton.--Illustrated.

M.D.--Ilustrated.
AN AURORA. By Daylight.-Illustrated. MOSSES ABOUT LONDON.
THE STORY OF A GRAVEL Pır. By J. E. INSECTS AT HOME.-Illustrated.
Taylor, F.G.S.

THE DRAGON FLY.
THE SMALL EGGAR-MOTH.- Illustrated.
With a host of interesting information in MicroscoPY, GEOLOGY, ZOOLOGY, BOTANY.

Notes and QUERIES. NOTICES TO CORRESPONDENTS &c.

London : ROBERT HARDWICKE, 192 Piccadilly, W.

THE

MONTHLY MICROSCOPICAL JOURNAL.

No. 37, for January 1872. Price 1s. 6d.

CONTAINS: I. THE MARKINGS ON THE BATTLEDORE SCALES OF SOME OF THE LEPIDOPTERA. By John

Anthony, M.D. Cantab., F.R.M.S., &c. II. THE NERVES OF CAPILLARY VESSELS, AND THEIR PROBABLE ACTION IN HEALTH AND

DISEASE. By Dr. Lionel S. Beale, F.R.S., Fellow of the Royal College of Physicians,

Physician to King's College Hospital. III. Vote on DR. BARNARD's Remarks on The EXAMINATION OF NOBERT'S NINETEENTH

BAND.' By J. J. Woodward, Assistant-Surgeon U.S. Army. IT. A New ERECTING ARRANGEMENT, ESPECIALLY DESIGNED FOR USE WITH BINOCULAR

MICROSCOPES. By R. H. Ward, M.A., M.D., Professor of Botany and Microscopy in

Rensselaer Polytechnic Institute. 1. Os A New MICROMETRIC GONIMOTER EYE-PIECE FOR THE MICROSCOPE. By J. P. South

worth. VI. ON THE ACTION OF HYDRO-FLOURIC ACID ON Glass, VIEWED MICROSCOPICALLY. By

H. F. Smith, Esq. With Reviews of Books and Summary of Microscopical Progress at Home and Abroad. Now ready, in Cloth, price 108, 6d., Vol. VI. of the above, 388 pp., and 19 whole-page plates ;

also Vols. I., II., III., IV., and V. may be had in Cloth, price 10s. 6d. each.

London : ROBERT HARDWICKE, 192 Piccadilly, W.

THE POPULAR SCIENCE REVIEW,

NO. XLI., October 1871, price 2s. 6d.

CONTAINS:
How Fishes BREATHE. By J. C. Galton, M.A., F.L.S.
MR. CROoxes' New Psychic FORCE. By J. P. Earwaker.
The Moss WORLD. By R. Braithwaite, M.D., F.L.S.
THEORY OF A NERVOUS ETHER. By B. W. Richardson, M.A., M.D., F.R.S.
Os PLEISTOCENE CLIMATE, AND THE RELATION OF THE PLEISTOCENE MAMMALIA TO THE

GLACIAL PERIOD. By W. Boyd Dawkins, F.R.S.
STAR STREAMS AND Star SPRAYS. By R. A. Proctor, B.A., F.R.A.S.

Reviews of Books, AND SUMMARY OF PROGRESS IN EVERY DEPARTMENT OF SCIENCE. Complete Sets in Numbers, £5. 2s. 6d. ; or 10 vols. in cloth, £6. 38.; half-morocco, £7. 13s.

Landon : ROBERT HARDWICKE, 192 Piccadilly, w.

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