IHO 



INTRODUCTION T(J ZOOLOGY. 



plasm, crustaceans, vinegar worms, blood corpuscles 

 in the tail of a minnow or in the web of a frog's 

 foot, are shown as easily as with a mounted slide. 

 Small glass tanks, made by cementing rubber ends 

 and bottom to two glass slips for sides, are useful for 

 showing living animalcules. 



A picture of such an apparatus, whicli cost, all 

 told, .$1.R», exclusive of tlie microscope, is here given. 

 It has been found very effective and useful. 



MKItOGHAPHTf fAMKR.V. 



1 Arniuaed fur .sliowiui;: a inieroscnpic dlOec-t to .several persons iit once.) 



Another device for showing an object to a class is 

 easily available, and a picture of this also is given. 

 This device, called a micrographic camera, was designed 

 and used for photogi-apliing from a microscope^ but 

 it was found to be very usefid also for showing an ob- 

 ject to half a dozen persons at once, and has been 

 used for that purpose. 



