118 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



(3) Illuminating and other Apparatus. 



Electric Microscope Lamp.* — Mr. J. E. Barnard has surmounted 

 the difficulty of adapting the incandescent lamp to Microscopical pur- 

 poses by strongly illuminating a white surface. The lamp (tig. 20) is- 



Fig. 20. 



Fig. 21 



enclosed in a brass tube, 

 cut off obliquely at the end 

 and with an aperture oppo- 

 site the oblique surface. 

 The inner surface of the 

 tube is coated with a thick 

 layer of zinc oxide which, 

 when illuminated, reflects 

 a perfect white light of suf- 

 ficient intensity for most 

 microscopical purposes. _. 



Winton's Micro-Polariscope for Food Examination. y — ^ r - A - L- 

 Winton lias found polarised light of great value in the examination of 

 foods, particularly in the detection of starches as adulterants. He 

 thinks the method quicker and surer than the iodine test. For this 

 purpose he uses an arrangement which he has adapted to a Bausch and 

 Lomb's Continental Microscope. J 



* Trans. Jenner (late British) Inst. Prev. Med., ser. ii. (1899) pp. 252-3 (1 fig.), 

 t Journ. App. Micr., 1899, pp. 550-1 (2 figs.). 



I The device is. however, riot new. In the volume of this Journal for 1881 

 (fi^. 48, p. 302) will be found the description of an adapter, and also (fig. 210,. 



