INTRODUCTION. 59 



not exhibited by vegetables, but belong exclusively to animal or- 

 ganizations. They bring the animal body into relation with the 

 external world, and preserve it from external dangers, by means of 

 sensation, movement, consciousness, and volition. They are more 

 particularly distinguished by the name of the animal functions. 



Lastly comes the study of the entire process of EEPBODUCTION. 

 Its phenomena, again, with certain modifications, are met with in 

 both animals and vegetables ; and might, therefore, with some pro- 

 priety, be included under the head of vegetative functions. But 

 their distinguishing peculiarity is, that they have for their object 

 the production of new organisms, which take the place of the old 

 and remain after they have disappeared. These phenomena do 

 not, therefore, relate to the preservation of the individual, but to 

 that of the species; and any study which concerns the species 

 comes properly after we have finished everything relating to the 

 individual. 



