ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



117 



the case of the objective-frame close to the objective, so that all rays 

 which reach the sensitive plate must of necessity have passed through 

 the solution. 



Fig. 21. 



Marktanner's Photomicrographic Cameras.*— Herr T. Marktanner 

 describes two photomicrographic cameras which he has devised. 



The first is made on the Gerlach system, and consists of a wooden 

 chamber, not made to draw out, which is placed upon the body-tube. It 

 is distinguished from the camera of Gerlach by tbe basal table, which is 



* Bull. Soc. Belg. Micr., xiii. (1S87) pp. 18S-91 (2 figs.). 



