62 



THE ORGANIZATION OF 



kind of constriction, but in later years observers have discovered 

 that the process is attended with considerable preparation, and 

 from this it came to be known that it is, as I have said, a com- 

 promise between self-division and budding. 



In order that you may fully appreciate the, character of this 

 compromise, I must first illustrate some parts of the organization 

 of the Infusoriaii which I have chosen for this purpose. It goes 



by the name of Trumpet-animalcule, (fig. 30,) on account of its 



Fig. 31. 



Fig. 30. 

 Fig. 30. Stentor polymorphic. Ehr. 130 diam. The Trumpet-animalcule, 



expanded and bent slightly over toward the observer ; the mouth (m) next the 

 eye, and the dorsal edge in the distance, a, the posterior end; ,s-A, the tube 

 enclosing a ; m, the mouth ; c, the ciliated border of the disc (s) ; b, the larger, 

 rigid cilia ; eu, the contractile vesicle in the extreme distance, seen through the 

 whole thickness of the body ; cv l , ct? 2 , the posterior prolongation of cr, in the 

 distance ; r, rl, the circular and radiating branches of the nervous system ; n, n 1 , 

 the reproductive system, extending from the right side, at n, posteriorly, but to- 

 ward the eye at n 1 . Original. 



