10 ZOOLOGY. 



very acts of mastication, deglutition, &c., are all the results 

 of divers phenomena dependent on various organs and func- 

 tions. 



22. The utmost variety prevails in the organization of 

 different animals. In some, the functions are simple ; and 

 this implies a harmonious simplicity of the organs. In 

 others, complexity is the law. Between the mode of existence 

 and the mode of organization of each heing, there is the most 

 admirable accord. The proofs will be given in a future part 

 of this work. 



The history of the functions of animals will now engage 

 our attention, and first, of the function of nutrition. 



a 



Fig. 1. 



Diagram taken from the " Text Book of Physiology," by Valentin,* 

 intended to show that every part of an organ is a mass which is traversed by 

 interstices in all directions. If a liquid body presses on c, while an elastic 

 one is present at d, it also renders them capable of serving as a filter. K. K. 



* " A Text Book of Physiology." By Valentin. Translated by Dr. 

 Brinton. H. Eenshaw, Strand. 



