CH. IXa\ 



PROJECTION MICROSCOPE 



267 



FIG. 211 



FIG. 211. Slide of several sections with a black mask, perforated over the sec- 

 tions to be demonstrated with the projection microscope. This mask is put on the 

 back of the slide and not on the cover-glass. 



Unless one has a mask something like this the light is so dazzling that it is 

 almost impossible to find the proper sections. It is easily removed by placing the 

 slide on wet blotting paper. 



FIG. 212 A. Leitz Large Micro- Projection Apparatus (cuts loaned by Win. 

 Krafft, N. Y.} In this figure the apparatus is in position for projection with a 

 projection ocular. 



Each part is. independent and capable of special adjustment. (As shown in the 

 next figure, the microscope may be turned aside, leaving the apparatus for 

 ordinary lantern slide projection}. 



