726 SUMMARY OF CURRENT RESEARCHES RELATING TO 



Abbe, E. — TJeber optisclies Glas. (On Optical Glass.) 



[Title only, with demonstration of Microscopes -with lenses made of the new 

 glass.] 



SB. Jenaisch. Gesell. f. Med. n. Naturwiss. for 1884 (1885) p. 32. 



„ „ TJeher Object und Bild. (On Object and Image.) [Title only.] 



Ibid., p. 34. 



American Society of Microscopists. — Eighth Annual Meeting at Cleveland, O. 

 [Circular issued by the Society. Also note by E. H. GrifSth.] 



Amer. Mon. Micr. Journ., VI. (1885) p. 119. 

 The Microscope, V. (1885) pp. 132-3, and 135. 



Beckwith, E. F. — Eesolution of AmpMpleura. 



[" On a slide prepared by H. H. Chase, with a refractive index of 2 '42, I 

 have succeeded in clearly resolving .A. pellucida with a dry 1/5 in. of 135° 

 au' angle."] 



The Microscope, V. (1885) pp. 131-2. 



Behrens, J. W. — The Microscope in Botany. A guide for the microscopical 

 investigation of vegetable substances. Transl. and edited by A. B. Hervey 

 and R. H. Ward. xvi. and 466 pp., 13 pis. and 152 figs., 8vo, Boston, 1885. 



„ „ Observation by Artificial Illumination. 



„ „ The Ocular Micrometer (and additions by R. H. Ward). 



Micr. Bulletin (Queen's) II. (1885) pp. 20-1, 

 , from The Microscope in Botany. 



Caepentee, W. B. — WaUich Condenser. 



[Remarks on the very great increase of focal depth with the Binocular. 



" Tliere was one very curious thing about the Binocular Microscope, that 

 it did increase very greatly the focal depth. He had tried this under 

 every condition, and had always found it to be so. It was to be explained 

 to a certain extent by the binocular prism halving the apei'ture of the 

 objective. That, however, did not explain it altogether ; because having 

 asked a friend to look through the binocular with one eye only, the prism 

 being in its place, and to focus the objective for what he considered to be 

 a medial distance, on then asking him to open the other eye, the differ- 

 ence in the depth of focus had been at once observed ; indeed, it was 

 considered that the increase amounted to at least five times. He had 

 talked the matter over with his friend Sir Charles Wheatstone, but they 

 could never come to any satisfactory conclusion."] 



Journ. Quek. Micr. Club, II. (1885) pp. 1 45-6. 



C HAL ON, J. — Note sur I'Objectif 1/16 de pouce de Powell et Lealand. (Note on 

 the 1/16 in. objective of Powell and Lealand.) 

 [Description of details of construction.] 



Bull. Soc. Belg. de Micr., XI. (1885) pp. 196-8. 



Chaney, L. W., jun. — Microscopical Exhibits at the New Orleans Exposition. 



Amer. Mon. Micr. Journ., VI. (1885) pp. 102-4 (2 figs.). 



Chtjn, C. — Katechismus der Mikroskopie. (Catechism of Microscopy.) 



[Part I. Theory of the Microscope, pp. 3-81. Part II. Use of the 

 Microscope, pp. 82-95. Part III. Methods of Investigation, pp. 

 96-138.] 



viii. and 138 pp. and 97 figs., 8vo, Leipzig, 1885. 



Eteenod, a. — Des Illusions d'Optique dans les Observations au Microscope. 

 (Optical illusions in microscopical observations.) 8 pp., 8vo, Geneve, 1885. 



FouLEETON, J.— Microphotography. 



[Demonstration to the Western Microscopical Club.] 



Engl. Mech., XLI. (1885) pp. 320-1. 



