ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 889 



Beeching, S. — Amateur Lens-grinding. 



Engl. Mech., XLI. (1885) pp. 498-9 (1 fig.). 

 Bles, E. J. — Opaque Illumination. 



[Maiuly an historical summary of the various appliances.] 



Tri.ns. .and Ann. Rep. Manchester Micr. Soc, 1884-5, pp. 23-6. 

 BuBBiLL, T. J. — Photographs ot Amphipleura pellucida. — New Heliostat. 



[Good photographs obtained by Dr. H. J. Detmers with a common coal-oil 

 lamp. — Note of the construction of a new Heliostat of simple mechanism 

 for photo-micrography.] 



Scknce, Yl. (188.5) p. 228. 

 C, L. P. DE. — Le Microscope grande modele de Hartnack et Prazmowski. (The 

 large model Microscope of Hartuat'k and Prazmowski.) 



[Description of it, with the modifications introduced by their successors 

 Be'zu, Hausser & Co. — principally an excentric diaphragm in place of a 

 eliding one, and an adapter for changing objectives.] 



Journ. de Microijr., IX. (1885) pp. 262-3. 

 Caplatzi, a. — See " Orderic Vital " and " Rector." 

 Cooper, W. A. — Daylight v. Lamplight for microscopical observation. 



[Quotation of Dr. Carpenter's views in favour of daylight as against Mr. 

 Nelson's.] 



Engl. Mech., XLI. (1885) p. 564. 



DuBOSCQ, T. and A. — Nouvel appareil de grandissement pour la projection, 



soit des tableaux de grandes dimensions, soit des objets microscopiques. 



(New magnifying apparatus for the projection of large pictures or microscopic 



objects.) \_Supra, p. 861.] Comptes Rendus, CI. (1885) pp. 476-7. 



DroLET, p. H. — Triceratium Davyanum. 



[3 photo-micrographs x 408, representing the diatom when viewed in 3 

 difiierent focal planes.] 



.Tourn. N. York Micr. Soc, I. (1885) pp. 145-6, and p. 157 (3 photographs). 

 DcRAND, W. F. — A practical method of finding the optical centre of an objective 

 and its focal length. IPost.'] 



Amer. Mon. Micr. Journ., VI. (1885) pp. 141-5 (1 fig.). 

 Dynamo-electric Machines. 



[Exhibition of two small machines, one operated by the foot and the other 

 by hand. " For microscopical illustration [a dynamo] can be used with 

 great advantage, especially in photography."] 



Journ. N. York Micr. Soc, I. (1885) p, 156. 

 Fasoldt's (C.) Detaching Nose-piece. 



[See this Journal, IV. (1884) p. 959.] 



Amer. Mon. Micr. Journ., VI. (1885) pp. 149-50 (1 fig.). 

 Grant, F. — Microscopical. 



[Whether daylight or lamplight is the better for illumination "can be 

 settled only by experience." — Measuring amplifying power of the 

 Microscope and angle of aperture of objectives. — Advantages and dis- 

 advantages of large apertures. — Explanation of numerical aperture.] 



Engl. Mech., XLII. (1885) pp. 57-8. 

 Gray's (8.) Water Microscopes. 



[Claim by "the ghost of Stephen Gray" that Hippisley's Pocket Field 

 Microscope infra is an inferior form of Gray's Water Microscope.] 



Engl. Mech., XLI. (1885) p. 520. 

 Gundlach's Improved Microscope Objectives. \^Supra, p. 863.] 



Amer. Mon. Micr. Journ., VI. (1885) pp. 130-1. 

 Habt, C. p. — Making a Microscope into a Microtome. [Supra, p, 861.] 



Science, VI. (1885) p. 228. 

 Habtings, C. S. — On the Colour Correction of double Objectives. 



Engl. Mech., XLL (ISS.O) pp. 559-60; XLII. (188.5) pp. 8-9; 

 froiu Amer. Journ. Sci., XXIII. (1882). 

 Henocque. — Appareils destines a I'examen du sang. (Apparatus for tho 

 examination of bkxjd.) [I'o.tt.'] 



Journ. Soc. Scientifiques, I. (1885) p. 24. (Soc. de Biologic, 11th Jan.) 



