ZOOLOGY AND BOTANY. MICROSCOPY, ETC. 



699 



parts of the lenses. The loups are fitted up in a sort of camera, which 

 may be worn over the eyes and secured by a band behind the head. 



Zeiss' Improved Algascope.* — A " No. 1 Combination Lens " is fitted 

 to a sliding sleeve, to which a small stage with spring object-holders is 

 attached. In this form the lens is known as the " improved Algascope." 



Fig. 130. 



The " combination lens " consists of three achromatic lenses combined 

 with an achromatic dispersion lens, which also serves as an eye-piece. 

 The magnifications obtainable from different members of the series vary 

 between 11 and 100 diameters. 



(3) Illuminating and other Apparatus. 



Zeiss' Epidiascope.f — This is an apparatus for the projection of 

 objects lying in a horizontal position. It employs reflected light in 



* Catalogue, English edition, 1902, p.' 23. 



t Special Catalogue. 



