ZOOLOGY AND BOTANY, MICROSCOPY^ ETC. 6G7 



GrNDLACn, E. — Optical Errors and Human Mistakes. 



Proc. Amer. Soo. Mkr., 9th Ann. Meeting, 1886, pp. 157-GO. 

 Heath, E. S. — A Treatise on Geometrical Optics. 



[Contains sections on the Simple Microscope; Coddington lens. Stanhope lens, and 

 Stanhoscope ; Doublets of Wollaston, Pritchard, and Chevalier ; sketch of theory 

 of telescopes and Microscopes ; the Compound Microscope ; magnifying power 

 of the Microscope; on the measure of the aperture of the Microscope, post; 

 recent improvements in the Microscope.] 



xvii. and 356 pp., figs., 8vo, Cambridge, 1887. 

 HiMES, C. F. — The Stereoscope and its Applications. 

 [Includes the Binocular Microscope.] 



Jmirn. Franklin Institute, CXXIII. (1887) pp. 398-408, 425-41, 3 pis. and 13 figs. 

 James, F. L. — 



[" The Neglected Twin nowhere proves his usefulness more than in microscopy. 

 The observer who has his left hand properly trained has the purely right-handed 

 one at an immense di.sadvantage. This is especially true in working with high, 

 or comparatively high, powers. Try it, and you will see. With the left hand 

 to manage the stage and the riglit upon the micrometer adjustment, one can get 

 over a slide in less than half the time occupied when the right hand i.s constantly 

 leaving the adjustment to regulate the stage."] 



St. Louis Med. and Surg. Jmtrn., LII. (1887) p. 348. 

 Eebber, A. — Bestimmung der Brechnngs-exponenten, fiir welche die chromatische 

 Abweichung zu hehen ist. (Determination of the refractive exponents for which the 

 chromatic aberration is to be removal.) 



Ccntral-Zlg.f. Optik u. Mech., VIII. (1887) p. 97. 

 „ „ TJeber die Korrektur von Systemen grbsserer OeflEnnng. (On the correc- 

 tion of systems of large aperture.) Ibid., pp. 145-6. 

 Magnifying-power of Objectives, Measurement of. 



[Inquiry by F. R. Brokenshire and replies by R. Gill, G. H. Bryan, F. J. George, 

 and •' Gamma Sigma."] 



Sci.-Gossip, 1887, pp. 90-1, 116, and 163-4. 



Engl. Mech., XLV. (1887) pp. 392 and 437. 



"Orderic Vital." — A lens used both for refraction and reflection, [and note by 



C. V. Boys.] Engl. Mech., XLV. (1887) pp. 443-4 (1 fig.), 468. 



PoLi, A. — [Eecent progress in the Theory of the Microscope.] 



liiiista Scicntifico-Industriale, April 30. 

 Nature, XXXVI. (1887) p. 262. 

 Rogers, W. A. — Methods of dealing with the question of temperature in the com- 

 parison of standards of length. 



Froc. Amer. Soc. Micr., 9th Ann. Meeting, 1886, pp. 67-74. 

 RoTSToy-PiGOTT, G. "W. — Microscopical Advances. XVIIL, XIX., XX., XXI. 

 [DiflEraction, Ancient and Modern.] 



Engl. Mech., XLV. (1887) pp. 331-2 (5 figs.), 379 (1 fig.), 

 427 (4 figs.), 475-6 (6 figs.). 

 Stokes, A. C— Focus Upward. 



["It has been said in a joking way ' that nothing will throw a microscojust into a 

 chill quicker than to see a friend look into his Microscope and focus downward 

 with his coarse-adjustment.' Yet men who ought to know better have been seen 

 to do this reprehen,sible thing."] 



Queen's Micr. Bulletin, IV. (1887) p. 23, from 'Microscopy for Beginners.' 



Zech, p. — Elementare Behandlung von Linsensystemen. (Elementary treatment of 



Lens-systems.) (Sep. Repr.) 16 pp., 8vo, Tubingen, 1887. 



(6) Miscellaneous. 



Microscopical Society of Calcutta. — A Microscopical Society has, on 

 the suggestion of Mr. W. J. Simmons, been founded at Calcutta,* with an 

 entrance fee and annual subscription of five rupees. It is intended to have 

 two Sessions, one in the cold season and the other in the middle of the 

 year, with a recess after each. Meetings will be held monthly. So far as 

 we know, this is the only Microscopical Society in any part of India. There 

 must be a large and very interesting field for microscopical work in that 

 part of the world, and we wish the new Society every success. 



* Indian Daily News, 1SS7, June 25. 



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