GENERAL MORPHOLOGY 



23 



natural state transparent, colorless, and apparently 

 homogeneous, possessing a very low power of refracting 

 light. They consist of a wall which is probably a 



FIG 1 



Microscope: A, ocular or eye-piece; B, objective; C, stage; D, "iris" dia- 

 phragm; E, reflector; F, coarse adjustment; O, fine adjustment; H, sub-stage 

 condensing apparatus; /, nose-piece. 



