The Sight and how to Preserve it |
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Page 8
... rays of light from an object enter the eye through the pupil ( P ) , and , passing back to the inner coat of the eye , the retina ( R ) , form an image of the object upon it very much as an image is formed on the plate in the camera O.N ...
... rays of light from an object enter the eye through the pupil ( P ) , and , passing back to the inner coat of the eye , the retina ( R ) , form an image of the object upon it very much as an image is formed on the plate in the camera O.N ...
Page 9
... rays of light ; but if it becomes opaque , it is called cataract , and the eye is more or less blind from the obstruction of the passage of light . MA is a little muscle , called the muscle of accommodation , that adjusts the focus of ...
... rays of light ; but if it becomes opaque , it is called cataract , and the eye is more or less blind from the obstruction of the passage of light . MA is a little muscle , called the muscle of accommodation , that adjusts the focus of ...
Page 10
... rays of light entering the eye . R , the retina , where they should be focussed . L , the lens by which the rays of light are chiefly focussed . nerve ( ON in the figure ) . But in order that the image of an object on the retina shall ...
... rays of light entering the eye . R , the retina , where they should be focussed . L , the lens by which the rays of light are chiefly focussed . nerve ( ON in the figure ) . But in order that the image of an object on the retina shall ...
Page 11
... rays of light that enter the eye are focussed on the retina , as seen in Fig . B , without effort on our part ; but if we regard near objects , as in reading or sewing , there is an effort of the eye to focus the rays of light ...
... rays of light that enter the eye are focussed on the retina , as seen in Fig . B , without effort on our part ; but if we regard near objects , as in reading or sewing , there is an effort of the eye to focus the rays of light ...
Page 12
... rays of light to a point . Notice that the lens ( L ) is more full in Fig . D than in Fig . C. If we look at distant objects the muscle relaxes , because the use of the accommodative power is un- necessary. 12 THE SIGHT .
... rays of light to a point . Notice that the lens ( L ) is more full in Fig . D than in Fig . C. If we look at distant objects the muscle relaxes , because the use of the accommodative power is un- necessary. 12 THE SIGHT .
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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,
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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