The Sight and how to Preserve it |
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Page 23
... feet corresponding to its number ( thus , 6 should be held at six feet , 12 at twelve feet , and 14 at fourteen feet away ) , he will find that the letters are not easily distinguished at the proper distance . Number 50 and number 20 ...
... feet corresponding to its number ( thus , 6 should be held at six feet , 12 at twelve feet , and 14 at fourteen feet away ) , he will find that the letters are not easily distinguished at the proper distance . Number 50 and number 20 ...
Page 31
... feet , nor No. 50 at fifty feet . Or if it be possible , in some light cases , to see those numbers at the required distances , it can only be done with great effort and by nearly closing the eyelids , so as to allow the rays of light ...
... feet , nor No. 50 at fifty feet . Or if it be possible , in some light cases , to see those numbers at the required distances , it can only be done with great effort and by nearly closing the eyelids , so as to allow the rays of light ...
Page 32
... feet distance , or nearly twenty feet distance . Those for reading should be the weakest with which he can read the fine type on page 22 at twelve inches from the eye . Weak and painful sight in adults due to near - sight is to be ...
... feet distance , or nearly twenty feet distance . Those for reading should be the weakest with which he can read the fine type on page 22 at twelve inches from the eye . Weak and painful sight in adults due to near - sight is to be ...
Page 39
... feet one letter appears less clear than the other , there is an inability of the eye to see vertical and horizontal lines equally well . The larger lines may be tried in the same way at from twenty to forty feet . A more complete test ...
... feet one letter appears less clear than the other , there is an inability of the eye to see vertical and horizontal lines equally well . The larger lines may be tried in the same way at from twenty to forty feet . A more complete test ...
Page 51
... feet and 50 at fifty feet distance . They are not able to read the type below at a distance of twenty - four inches . One with correctly formed eyes can do this with- out unusual effort . EXTRACT FROM PROF . HUXLEY . " The educational ...
... feet and 50 at fifty feet distance . They are not able to read the type below at a distance of twenty - four inches . One with correctly formed eyes can do this with- out unusual effort . EXTRACT FROM PROF . HUXLEY . " The educational ...
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Common terms and phrases
30 Coloured Plates accommodative power adjusting power BOTANY BRITISH BIRDS BRITISH BUTTERFLIES brought cataract cinder cloth extra cloth gilt Coloured Figures concave glasses Containing convex glasses Crown 8vo Demy 8vo Descriptions disease distant objects Enlarged enter the eye eye-ball eye-glasses fatigue Fcap FERNS Figures of Eighty FLOWERING PLANTS FLOWERS focus focussing power Fourth Edition HARDWICKE & BOGUE Health HENRY POWER Illustrated with 32 Illustrated with numerous inches J. E. TAYLOR JARDINE Larvæ Lecture lens London look MANUAL Marsupialia MICROSCOPE MORTIMER GRANVILLE muscle of accommodation muscle of convergence myopia NATURAL HISTORY NEAR-SIGHT IN CHILDREN noticed numerous Illustrations numerous Woodcuts oculist old sight pain Piccadilly Plain and Easy Plants PROGRESSIVE NEAR-SIGHT pupil Quarterly R. A. PROCTOR rays of light reach the retina reduced price 16s regard near objects Science Gossip Second Edition seen in Fig Sir WILLIAM JARDINE Species super-royal 8vo Third Edition tion tissues upper lid Vols weak sight Woodcuts
Popular passages
Page 26 - BONAPARTE. NEW AND ENLARGED EDITION, completed by the insertion of above One Hundred Birds omitted in the original Work, and Illustrated by valuable Notes, and Life of the Author, by Sir WILLIAM JARDINE. Three...
Page 51 - The educational abomination of desolation of the present day is the stimulation of young people to work at high pressure by incessant competitive examinations. Some wise man (who probably was not an early riser) has said of early risers in general, that they are conceited all the forenoon and stupid all the afternoon.
Page 15 - A PLAIN and EASY ACCOUNT of BRITISH FERNS. Together with their Classification, Arrangement of Genera, Structures, and Functions, Directions for Out-door and Indoor Cultivation, &c. Numerous Coloured Illustrations. A New Edition in preparation.
Page 28 - SCIENCE GOSSIP: An Illustrated Medium of Interchange and Gossip for Students and Lovers of Nature. Edited by JE TAYLOR, Ph.D., FLS, FGS, &c.
Page 11 - By HERBERT FRY. Showing, in alphabetical order, their Name, Date of Foundation, Address, Objects, Annual Income, Chief Officials, &c.
Page 9 - THOMAS, THE PREPARATION and MOUNTING of MICROSCOPIC OBJECTS. New Edition, greatly Enlarged and brought up to the Present Time by JOHN MATTHEWS, MD, FRMS, Vice-President of the Quekett Microscopical Club. Fcap. 8vo, cloth, 2s.
Page 22 - Drawing of every British Plant. Edited and brought up to the Present Standard of Scientific Knowledge by T. BOSWELL (formerly SYME), LL.DFLS, &c. With Popular Descriptions of the Uses, History, and Traditions of each Plant, by Mrs. LANKESTEB, Author of " Wild Flowers Worth Notice," " The British Ferns,
Page 22 - FLS MUSHROOMS AND TOADSTOOLS: How to Distinguish easily the Difference between Edible and Poisonous Fungi. Two large Sheets, containing Figures of 29 Edible and 31 Poisonous Species, drawn the natural size, and Coloured from Living Specimens. With descriptive letterpress, 6s. ; on canvas, in cloth case for pocket, los.
Page 25 - Containing an Alphabetical List of the House of Lords, Dates of Creation, Lists of Scotch and Irish Peers, Addresses, &c. 32mo, cloth, is. Published annually. THE SHILLING BARONETAGE. Containing an Alphabetical List of the Baronets of the United Kingdom, Short Biographical Notices, Dates of Creation, Addresses, &c.
Page 18 - Man. INSECTS, 7 Vols. Introduction to Entomology, British Butterflies and Moths, 2 Vols., Foreign Butterflies and Moths, 2 Vols., Beetles, Bees. FISHES, 6 Vols. Introduction and Foreign Fishes, British Fishes, 2 Vols., Perch Family, Fishes of Guiana, 2 Vols. Fuller Details of these will be found under the authors