Publications of the Ray Society—continued.

Folio, price £1. 11s. 6d.

The British Spiders.

A History of the Spiders of Great Britain and Ireland. By JoHN BLACKWALL, F.L.S. Part I. with 110 Examples, coloured by hand.

In 1 vol. imp. 4to. pp. 319, with 22 Plates £1. 11s. 6d.

Introduction

minifera.

to

the Study of the Fora

By W. B. CARPENTER, M.D., F.R.S., F.L.S., &c.; assisted by W. K. PARKER, Esq., and T. RUPERT JONES, Esq., F.G.S.

In 1 vol. 8vo. cloth, pp. 506, with 65 Plates. £1. 5s. 6d.

On the Germination, Development, and Fructification of the Higher Cryptogamia, and

on the Fructification of the Coniferæ.

By Dr. WILHELM HOFMEISTER.
F.R.S., Sec. L.S.

Translated by FREDERICK CURREY, M.A.,

Crown 8vo. cloth, price 7s. 6d., with Illustrations from Nature by

Tuffen West.

On Diseases of the Kidney and

Dropsy.

By S. J. GOODFELLOW, M.D., F.R.C.P., Physician to the Middlesex Hospital.

"A whole profession is elevated when such creditable works are produced by any one of its members."-Dobell's Lectures.

"The work cannot fail to prove exceedingly instructive, either to the student or to those members of the profession who have not had an opportunity of keeping up their knowledge of the various discoveries which have been made of late years in renal pathology and therapeutics. A very good digest of all that is known of any practical value upon the subject; and at the same time forms an excellent guide to enable the practitioner to discriminate the different forms of 'Bright's disease' during life, and thereby put him in a position to conduct the treatment on the soundest principles."-Glasgow Medical Journal.

"To the student who desires to know what possible or presumable explanations can at present be suggested of the origin of the various units in the complex series of morbid states therein included, Dr. Goodfellow's work may be recommended."Lancet.

"We cannot but recommend it strongly to the profession as the result of thoroughly conscientious hard work, embodied in a form very interesting to the intelligent reader."-London Medical Review.

ROBERT HARDWICKE, 192, Piccadilly, w.

Demy 8vo. price 5s.

Prevention of Consumption

11

(Practical Observations on the); with Statistical Tables of the Prevalence of the Disease, and of the comparative Salubrity of various Places. By JOHN HOGG, M.D.

"Dr. Hogg appears to have bestowed much attention and thought much upon the causes and hygienic treatment of pulmonary tuberculosis. He strives to show that whilst deep and earnest study has been devoted to the etiology and pathology of the disease, to the nature and quality of tubercle, to the composition of the blood and of all the secretions of the body, its preventive treatment has not engaged the attention of physiologists as much as the importance of the subject demands. Dr. Hogg's work will afford the inquirer much valuable statistical information, and many hygienic hints in connection with pulmonary tuberculosis."-Lancet.

Crown 8vo. cloth, price 2s. 6d.

The Gastric Regions, and the Victualling Department.

By AN OLD MILITIA SURGEON. The whole outward and inward man, from the crown of his head to the corns on his little toes, all tell the sad tale of the Gastric Regions' Wrongs.

"This is a most useful, and by no means a dull or heavy book. The Old Militia Surgeon gives some most useful advice, in a pleasant practical manner, respecting different varieties of food and their effects upon the system."-Observer.

"It is a treatise full of sense and reason, and well worth reading and study.”— Weekly Dispatch.

"A capital chapter on what to eat and drink."-Atlas.

"A copy of this little volume would be a very appropriate companion to the Manual of Drill, which is, of course, the vademecum of every rightly-constituted rifleman."-United Service Gazette.

The

8vo. price 28.

Health of the Royal Navy Considered.

In a Letter to the Right Hon. Sir John S. Pakington, Bart., by Gavin Milroy, M.D., F.R.C.P., Medical Inspector under the Board of Health from 1849 to 1854, Medical Commissioner to Jamaica in 1851, and Member of the Sanitary commission to the Army in the East in 1855-56.

12

ROBERT HARDWICKE, 192, Piccadilly, w.

Fcap. 8vo. cloth, price ls.

The Influence of Railway Travelling on Public Health.

From the Lancet.

"We strongly recommend the work to all who are connected with the management of railways, or in the habit of travelling by them. The mass of evidence goes to prove that whilst the actual danger of life in travelling by rail is comparatively small, that to health is, from various causes, considerable. But for the discussion of these and their remedies, we must refer the reader to the book itself."-Dispatch.

Bound in Leather.

Mangnall's Questions, Complete, 1s.

The Cheap Edition of this valuable School Book is now ready. It has been carefully revised and brought up to the present time. It is well printed and strongly bound.

"Published in a compact form, neatly bound, and being condensed without being abridged, comes before us in a greatly-improved form. Few books contain so much information in so small a space."-Portsmouth Guardian.

"A new edition, published at a small cost, of one of the best of our standard school-books; abridged from the general work, but not rendered less useful, as the curtailment has not decreased the number of questions, but merely got rid of superfluous descriptions."-Plymouth Herald.

"A most useful book for adults to refresh their memory. The present edition has been brought down to the present time, and includes a short biography of the Duke of Wellington, Sir Robert Peel, Lord Raglan, and others."-Portsmouth

Times.

"This popular school-book is here presented in a condensed rather than an abridged form, and with many marked improvements, at the low price of 1s.; it will no doubt come into general use."-Kent Herald.

"Mangnall's Questions,' arranged as they are here, form one of the most useful school-books we have seen."-Sherborne Journal.

"A very good edition."-Cambridge Chronicle.

"To those engaged in tuition, and to many others, the work will be found highly useful."-Windsor Express.

"To praise this work is superfluous, since its merits are so widely known. The present edition is well got up in every respect."-Shrewsbury Journal.

"This is a cheap and improved edition of a valuable manual, for which we predict a decided preference over many other rudimental educational works of this class. An exceedingly welcome companion to all intrusted with the office of tutor."-Taunton Courier.

"Mangnall's Questions' are amongst the most familiar and well-worn steps to knowledge. The edition issued by Mr. Hardwicke shows a reduction in bulk, but has been augmented in comprehensiveness."-Brighton Examiner.

"Mangnall's Questions' have long since taken their place in the middle-class schools of the country, and the only ground on which they can ever be ejected is, that the lapse of time renders them defective or obsolete. Continued and careful editorship is therefore necessary; and this editorship the present edition has received."— Sunderland Times.

ROBERT HARDWICKE, 192, Piccadilly, w.

8vo. price ls.

Vegetable Charcoal.

13

Its Medicinal and Economic properties, with practical remarks on its use in chronic affections of the Stomach and Bowels. By JAMES BIRD, M.R.C.S.

Hardwicke's Elementary Books.

PRICE TWO PENCE EACH.

UNDER the above title is presented to the Public a complete Library of Elementary Works adapted for the use of the People.

Thousands of people at present skilled as handicraftsmen, and as workers in the various arts and sciences of life, work from day to day, plodding on with some vague notion that they can improve their own particular calling; but it generally ends in nothing, because they are ignorant of the first principles of those laws which regulate the things in which they are engaged. It is a very rare occurrence to meet with workmen who know anything beyond what they picked up in their apprenticeship, or obtained by imitating others more skilled than themselves.

It will be the aim of HARDWICKE'S ELEMENTARY Books to teach these first principles.

No labour or expense will be spared to make the information of a thoroughly reliable character; and, where advisable, a free use of authentic illustrations will be brought to bear.

Mechanics.

NOW READY:

The principles of Mechanics and the elements of Machinery. Containing: Action and reaction-Aerolites-Air, compressed, power-Atmosphere, resistance of-Balance-Balloon, gravitation of-Central forces-Centrifugal force-Compound machinery-Cord, multiplied-Cordage, rigidity of-Curved surfacesCurvilinear motions-Earth, gravitative attraction of-Elasticity-Endless screw -Equilibrium, or rest-Forces, composition of, parallelogram of-Fly-wheelsFriction-Friction-wheels-Fulcrum, the-Gravitation, laws of-Gravity, centre of-Heat as a moving power-Impulse-Inclined Planes-Levers, system ofMachinery, compound-Materials, strength of-Mechanical powers-MobilityMomentum-Motion, accelerated, in curves, on inclined planes, oscillatory, relative, retarded, various kinds of-Moving bodies-Multiplied cord-Oblique action -Orbits, motion of bodies in-Oscillatory motion-Pendulums, compensating, oscillation of, relative lengths of-Percussion, centre of-Planes, inclined-Power, or impulse-Powers, mechanical, moving-Projection of bodies upward-Pulley, the-Pulleys, system of-Resistance-Scales-Screw, the-Stability-Steelyard -Strength of animals, of man, of materials-Treadwheel-Universal jointVelocity, accelerated, of falling bodies, of moving bodies-Wedge, the-Weight -Wheel and axle, and pinion, fly, friction-Whirling motion of liquids-and much more useful information. Fully illustrated by nearly 100 cuts. Two parts, 2d. each; complete, 4d. ; bound in cloth, 6d.

14 ROBERT HARDWICKE, 192, Piccadilly, w.

Hydrostatics.

Containing:-Aqueducts—

Fully illustrated. Complete, 2d.; in cloth, 4d. Artesian wells-Ball-cock of cisterns-Bellows, hydrostatic-Bramah's press— Buoyancy of solids-Canals, navigable-Capillary attraction-Compression of liquids-Density of liquids-Displacement-Diving-Elasticity-Flotation-Hydrometers-Hydrostatic balance, bed, bellows, press, pressure-Human body, specific gravity of-Levels, Survey-Liquids, compression of, elasticity of, lateral pressure of, pressure of, properties of, weight of-Locks, canal-Machines for raising water-Naval architecture-Press, hydrostatic-Pressure, hydrostatic, lateralPumps-Rain-Rain-gauge-Screw, in ships-Ships, iron, flotation of-Specific gravity-Specific gravities, tables of-Spirit-level-Springs, artesian-Subterraneous lakes and reservoirs-Swimming, art of-Siphon, the-Water-camel, falls, hammer, shed-Waterworks, ornamental-Weight of liquids-Wells-and other useful information.

Chemistry.

Three Parts, 2d. each; complete, 6d.; cloth, 8d. An introduction to Chemistry, including a popular summary of animal and vegetable physiology, accompanied by various chemical tables, with numerous illustrations. Containing:-AcidsAlbumen-Alcohol-Alkaloids-Atomic theory-Attraction, chemical-BasesBinary compounds-Carbon-Chemical affinity-Clays-Classification of metals— Colouring metals-Combustion-Divisibility of matter-Elective attractionElectro-chemistry-Elementary bodies-Elements-Fermentation-Fixed oilsForms of matter-Gaseous combinations-Hydrogen-Intermediate ElementsLife-Matter-Nitrogen-Nomenclature-Oils and fat-Organization-Oxidation -Oxygen-Primary compounds-Products of fermentation-Proximate elements -Salts-Simple substances-Specific gravities, tables of-Spontaneous combustion-Starch-Theory of the Ethers-Vegetable acids, &c. &c.—and other very useful information. 144 closely but clearly printed pages. Fully illustrated.

Hydraulics.

Fully Illustrated. Complete, 2d.; cloth, 4d.

Optics.

Fully Illustrated. Two parts, 2d. each; complete, 4d.; cloth, 6d.

Other Works of a similar character are in preparation, and will shortly be announced.

INTENDED FOR SCHOOLS OR SELF-INSTRUCTION.

Mackenzie's Educational Books.

ALREADY PUBLISHED.

Mackenzie's Tables.

Commercial, Arithmetical, Miscellaneous, and Artificers'. Calculations in Bricklaying, Carpentery, Lathing, Masonry, Paper-hanging, Paving, Planting, Plastering, Slating, Tiling, Well-sinking, Digging, &c. &c. Fractions and Decimals. Forms of Receipts and Bills. Calculations on Man, Steam, Railways, Power, Light, Wind, &c. Language and Alphabets. Calendar of the Church. Scripture Money. Principal Foreign Moneys and Measures. graphical and Astronomical Tables, &c. &c. Complete, price 2d.

Murray's English Grammar.

Complete, word for word with the Shilling Editions. Price 2d.

Geo