ZOOLOGY AND BOTANY, MICEOSCOPY, ETC. 



381 



Zeiss' Photomicrographic Stand. — In reference to Berger's New 

 Microscope, already described in this Journal,* fig. 90 shows the way in 

 which the " planar " projection lenses are adapted to this stand, and the 

 manner of placing it on the bed of the projection apparatus. 



Fig. 88. 



(2) Eye-pieces and Objectives. 



Spitta, E. J. — Achromatics versus Apochromatics. 



Amer. Mori. Micr. Journ., 1899, p. 296. 



(3)1 Illuminating and other Apparatus. 



Zeiss' Projection Arc-Lamp. — This is shown in Fig. 91, which 

 gives elevation and plan. The carbons are always inclined at about 40° 

 to the vertical, although by loosening the screw K they can be brought 



* 1898, p. 583, fig. 98. 



