ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



697 



Baker's Engineering" Microscope. — This Microscope (fig. 1IG) has 

 been specially designed for the examination and photography of metals, 

 and is adapted for the examination of opaque objects only. It has 

 diagonal rack-and-pinion coarse, and micrometer screw and lever fine 

 adjustments, but no means of substage illumination, and no stage aper- 

 ture. Illumination of the object is effected, when using low powers' 



Fig. 116 



by diffused daylight or artificial light ; when using the higher powers, 

 by means of a vertical illuminator, with diaphragms for regulating 

 the amount of illumination. The stage is provided with levelling 

 screws. 



Seibert's New Microscope, No. 5 A. — This is a new instrument 

 (fig. 147) of medium size, intended for scientists of all grades who wish 

 to carry out exact work with the best objectives and auxiliary apparatus. 

 The stand is sold at a very low price. The pillar is jointed for inclina- 



