864 SUMMARY OF CURRENT RESEARCHES RELATING TO 



Gundlach, B. — A Simple Method of Determining the Angle of Aperture of 

 Immersion Objectives. 



[Correction of the previous description at p. 142. Supra, p. 860.] 



Amer. Mori. Micr. Journ., III. (1882) p. 176. 

 Hitchcock, E. — The August Meetings. 



[Editorial on the Montreal meeting of the Amer. Assoc. Adv. Sci. and 

 the Elmira meeting of the Amer. Soc. Micr.] 



Amer. Mon. Micr. Journ., III. (1882) pp. 176-7. 

 „ „ The " Jumbo " Microscope. 



[Brief comment. Supra, p. 850.] 



Amer. Mon. Micr. Journ., III. (1882) p. 178. 

 „ „ The Microspectroscope. 



[Description of the Zeiss, Sorby-Browning and Sorby-Hilger instruments, 

 with observations on the application of the spectroscope to the examina- 

 tion of solutions or fluid compounds.] 



Amer. Mon. Micr. Journ., III. (1882) pp. 183-7 (3 figs.). 

 „ „ Committee on Kuled Plates. [Supra, p. 861.] 



Amer. Mon. Micr. Journ., III. (1882) pp. 197-8. 



Hogg, J. — The Microscope : its History, Construction, and Application ; being 



a familiar introduction to the use of the instrument and the study of microscopical 



science. New ed. 8vo, London, 1883, xx. and 764 pp., 356 figs, and 8 pis. 



[Supra, p. 862.] 



Jennings, J. H. — The Aperture Shutter. 



[Letter to the Editor in commendation, both iu photo-micrography and 

 ordinary microscopic work. " Some may say, ' why not use special 

 low-angle lenses which will give all requisite penetration?' Simply 

 because penetration is far from being the only desirable quality in an 

 objective. Lenses that possess great penetration usually possess little 

 else, and the loss of light entailed by their use is far greater than 

 that experienced when using a wide-angle lens with the aperture 

 shutter "(!)] 



North. Microscopist, II. (1882) pp. 279-80. 

 Jones, T. K. — Journal of the Koyal Microscopical Society. 

 [Review of Nos. 23-9.] 



Geol. Mag., IX. (1882) pp. 476-9. 

 Kitton, J. — The sign x . 



[Reply to T. R. J., ante, p. 746. " An inch is an inch, although its smaller 

 divisions are not indicated."] 



Sci.-Gossip, 1882, p. 232. 



Lattetjx, P. — Manuel de Technique Microscopique, ou guide pratique pour 



l'e'tude et le maniement du Microscope. (Manual of Microscopical Technic, or 



practical guide for the study and management of the Microscope). 2nd ed. 8vo, 



Paris, 1883, xi. and 477 pp., 176 figs. 



Malley, A. C. — Microphotography. 



[Reply as to finding the actinic focus of objectives, &c] 



Engl. Mech., XXXVI. (1882) p. 257. 

 " Micro." — Aperture. 



[Criticism of J. L. "W. Miles' paper, infra.'] 



North. Microscopist, II. (1882) pp. 281-2. 

 Mikroskop, das, und seine Anwendung bei Untersuchung von Hopfen, Hefe &c, 

 nebst Beschreibung und Gebrauchs-Anweisung des Hefezahlers. Eine Anleitung 

 fur Brauer u. Brenner. (The Microscope and its use in the observation of hops, 

 yeast, &c, with description of and instructions for using the yeast-counter. A 

 guide for Brewer and Distiller.) 8vo, Berlin, 1882, 20 pp., 1 pi. 



Miles, J. L. W. — The Optical Performances of Objectives — Aperture — The 

 Aperture-shutter. 



[Paper read before Manchester Microscopical Society.] 



North. Microscopist, II. (1882) pp. 284-91 . 

 „ „ Apertures and Amplification. 



[Reply to J. H. Jennings supra, and W. Stanley infra.'] 



North. Microscopist, II. (1882) pp. 319-20. 



