ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 247 



the screen during focussing. The inner end of the inside tube had the 

 universal Microscope screw to take the object-glasses used, which were 

 the 75 and 35 mm. of Zeiss. A single dark slide was employed, and a 

 carrier made to fit it having an aperture in the centre to take plates the 

 size of a twelfth of a quarter plate. One of these small plates was 

 emery ground on one side and used for rough focussing. Another was- 

 marginally ground leaving a clear space of about \ in. square in the 

 centre, and this was evenly smeared with thin virgin wax. This was 

 the fine focussing screen. The negatives to be copied were quarter 

 plates, illuminated by a 4-in. condenser placed immediately behind 

 them, and in almost close contact with them, their distance from the 

 camera being regulated by the size of the microphotograph desired with 

 each object-glass used. An ordinary paraffin lamp was the source of 

 light. It will be seen that no focussing screen on a separate frame was 

 used, the focussing glass being carried in the dark slide itself, and re- 

 moved each time the sensitive plate was put in, thus preserving the 

 perfect register obtained. 



Hinterberger, Hugo — TTeber Mikrophotographie. 



[An interesting lecture to the Vienna Camera Club. Describes the various 

 methods, and gives several good examples of photomicrography.] 



Published as a pamphlet from the Wiener Photo- 

 graphische Blatter, 8 pp. and 6 figs. 

 „ ., Einiges aus der mikrophotographischen Praxis mit 



Zeiss' grossem Instrumentarium. 



[A pamphlet of 6 pp. and 1 fig., detailing the method of using the instru- 

 ment — apparently intended mainly for his laboratory students.] 

 ,, „ Eine Notiz iiber mikrophotcgraphische Aufnahnien von 



Insektenpraparaten. 



[A practical pamphlet of 4 pp. and 4 pis. on the proper preparation and 

 treatment of insect specimens for photomicrography.] 



Published as a tract from the Photograpliischen Centralblalt 



(Callwey), Miinchen. 

 „ „ Versuch der farbenrichtigen Reproduction eines doppel- 



farbigen mikroskopischen Praparates nach zwei mit den gewohnlichen Hilfs- 

 mitt8ln der Mikrophotographie bergestellten Aufnabmen. (Investigation of the 

 reproduction in proper colours of a doubly stained microscopical preparation 

 with the ordinary accessories of photomicrography after two suitable exposures.) 



Camera Lucida, 1901, 8vo, H. 24, 3 pp. and 1 pi. 

 Mittheilungen aus dem photographischen Privat-Laboratorium des Universitats- 

 Lehrers Hugo Hinterberger in Wien. 



[A Report of the work for 1901, mainly in the department of photomicro- 

 graphy.] Wien, January 1902. 

 M'Clung, C. E. — Laboratory Photography. High-power Photomicrography. 



Journ. App. Micr., IV. (1901) p. 305. 



„ „ Photomicrographio Apparatus. 'Tom. cit., p. 1199. 



Penny, R. G. — Photomicrographic Apparatus. Amer. Mon. Micr. J., 1900, p. 310. 



(5) Microscopical Optics and Manipulation. 



Strehl, Dr. Karl. — Bericht iiber optische Fortschritte. (Review of progress in 

 Optics.) Central-Zeit. /. Opt. u. Mech., XXIII. (1902) p. 1. 



(6) Miscellaneous. 



The New Spectrum.* — Dr. S. P. Langley has now thoroughly 

 mapped out the infra-red spectrum. As tar back as 1884 he had ascer- 



* Annual Report of Smithsonian Institute, 1900, pp. 683-92 (1 pi.). 



