ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



225 



capillary vessels acting as minute spherical lenses, and the larger specks 

 with a slower and more wandering movement may be the amoeboid 

 movements of the white corpuscles which have escaped through the 

 walls of the vessels. . . • 



Fig. 36. 



Zeiss' Comparison Spectroscope for Colour Technology.* This 



apparatus (figs. 36, ;J7) is devised for simultaneously observing three 



* Carl Zeiss' Special Catalogue, 1906, pp. 4-6. 

 April 17th, 1907 



