228 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



MICKOSCOPY. . 



A. Instruments, Accessories, etc.* 

 (3) Illuminating- and other Apparatus. 



Microscope Illumination.t— K J. Clark has patented an apparatus 

 for illuminating microscope specimens by means of a low-voltage electric 

 lamp which is supported immediately below or within the substage con- 

 denser and is adjustable for focussing. As shown (fig. 1), the lamp B and 

 a reflector A are carried by an arm C, clamped to a vertical rod E bv a 



Fig. 1. 



nut D, the rod E being mounted on a stand F so that it may be rotated 

 or may be raised or lowered by means of a nut G. The illumination of 

 the specimen may be regulated by means of an adjustable resistance in 

 the lamp circuit. The lamp may be used with a dark-ground condenser 

 to obtain oblique illumination or dark-ground effects. 



(4) Photomicrography. 



SpirochaBta icterohaemorrhagica.ij:— A. C. Coles has succeeded in 

 photographing the minute spirals, 10-12 to each 5 /*, in spirochsetes 

 obtained from the common rat in England. They are diagnostic of 

 the newly-created genus, the Leptospira of Noguchi. 



* This subdivision contains (1) Stands ; (2) Eye-pieces and ^Objectives ; (3) 

 lUuminatmg and other Apparatus; (4) Photomicrography; (5)' Microscopical 

 Optics and Manipulation ; (6) Miscellaneous. 



t English Mechanic, Feb. 1, 1918, p. 16. 



J Lancet, March 30, 1918, pp. 468-9 (6 figs.). 



