422 SUMMARY OF CURRENT RESEARCHES RELATING TO 



numbers of the journal are equal to the first it will be a very useful 

 one, and should be supported by all the members of the Society. 



Aperture Diaphragm. [Ante, p. 2G2.] 



Jouni. Post. Micr. Soc, I. (1882) p. 51 (2 figs.). 



Aylwaku's (H. p.) Working Microscope. 



North. Microscopist, II. (1882) pp. 90-1. 



BAraiANN, T. — Eriimerungen aus meinem Leben, ein Beitrag zur Geschichte 



der Pracisionsmechauik. (Rt'collections from My Life, a Coutribution to the 



History of Precision-mechanics.) 



[Includes deiinition of natural and artificial objects, supra, p. 420.] 



Zeitschr. f. Instnimentenk., II. (1882) pp. 46-51. 



Bausch & Lome Co.'s New Trichinoscope. \_Ante, p. 258.] 



Amcr. Natural, XVI. (1882) pp. 429-31 (2 figs.). 



Bausch's Homogeneous-Immersion Objectives. 



l\ to Jji — 140° crowu-glass angle — adjustable for water or glycerine 



immersion.] . „, , ^ ,-,oDn\ o.r, 



-' Amer. Natural., XVl. (1882) pp. 347. 



Blackham, G. E. — Remarks on New ImmLrsion Objectives. 



[" Do not be troubled or deterreJ from efforts by ' theoretical limits,' no 

 matter how high the autbority that sets them. Newton's dictum as to 

 the impossibihty of constructing an achromatic telescope was a 

 stumbling-block in the progress of optical construction and astro- 

 nomical observation for years, and Mr. Wenham's count of 82° balsam 

 (1"00 N.A.), had it not been disregarded, would have proved an equal 

 barrier in the path of microscopical progress."] 



Bausch cj- Lomb Optical Co.'s Hupplement to tattilogue, Feb. 1882, p. 7. 

 Bolton, T. — Parkes' Class Microscope. [_Supra, p. 395.] 



Journ. Post. Micr. Soc, I. (1882) pp. 52, 55 (2 figs.). 

 C, F. — Microscopical Club. 



[Reply to H. C. S. as to the formation of such a club.] 



Engl. Mech., XXXV. (1882) p. 80. 

 Cox, J. D. — Telescopic Field and Microscopic Aperture. 



Amer. Mon. Micr. Journ., III. (1882) pp. 61-9 (3 figs.) p. 76. 

 Crisp, F. — Notes sur I'ouverture, la vision microscopique et la valeur des 

 objectifs a immersion a grand angle (Notes on Aperture, Microscopical Vision, 

 and the value of wide-angled Immersion Objectives)— cowW. 

 [Transl. of paper I. (1881) pp. 803-60.] 



Journ. de Microgr., VI. (1882) pp. 143-5, 190-3. 

 Croullebois, M. — Theorie ele'mentaire des Lentilles epaisses. (Elementary 

 Theory of Thick Lenses.) 



[Geometrical explanation of Gauss's theory — Compound Microscope, pp. 

 82-3.] X. & 117 pp. (50 figs.). 8vo, Paris, 1882. 

 D., E. T. — On Drawing and Painting from the Microscope. 



[Neutral tint reflector has often been a snare and delusion to young 



draughtsmen on account of the reversal of the image, which renders it 



ditficult to fill in the drawing frum the Microscope afterwards — prefers 



the Wollaston.] Sci.-Gossip, 1882, p. 74. 



„ „ The Microscope and Fine Art. 



[General remarks on Microscopical drawing and painting.] 



Sci.-Gossip, 1882, pp. 97-8. 

 Dancer, J. B. — On a Method of Mounting the Limiting Apertures for In- 

 creasing the Penetrating Power of Objectives. \_Supra, p. 407.] 



North. Microscopist, II. (1882) p. 92. 

 Davis, G. E. — The Aperture Shutter. 



[Further remarks as to the origin of tlie suggestion.] 



North. Microscopist, II. (1882) pp. 88-90 (2 figs.) p. 128. 

 ,, „ Electric Light for Micro; copy. 

 [Notes as to a trial of the Swan lamp in 1881.] 



North. AJicroscopist, II. (1882) p. 129. 

 Debt, J. — Apparatus for obtaining monochromatic light. 



[The beam of light from the lamp is condensed by a large bull's-eye, 

 passed through a slit, and refracted by a bi.sulphide of carbon prism.] 



