MOLECULAR AND MICROSCOPIC 

 SCIENCE, 



PAET HI. 



ANIMAL OKGANISMS. 



SECTION I. 



FUNCTIONS OP THE ANIMAL FRAME. 



ALTHOUGH animal life is only known to us as a mani- 

 festation of divine power not to be explained, yet the 

 various phases of life, growth, and structure in animals, 

 from the microscopic Monad to Man, are legitimate sub- 

 jects of physical inquiry, being totally independent of 

 those high moral and religious sentiments which are 

 peculiar to Man alone. 



The same simple elements chemically combined in de- 

 finite but different proportions form the base of animal 

 as well as of vegetable life. But besides the elementary 

 gases and carbon, many substances, simple and com- 

 pound, are found in the animal frame ; the phosphate 

 and carbonate of lime, iron which colours the blood, 

 and common salt which, with the exception of water, 

 is the only article of food we use in a mineral state. 

 Animals derive their nourishment, both directly and in- 

 directly, from vegetables. Their incapacity to change 



VOL. n. B 



