50 Elementary Biology. 



CHAPTER III. 



INDIVIDUAL AND TRIBAL LIFE DISTRIBUTION AND 

 CLASSIFICATION. 



SECTION I. INDIVIDUAL LIFE. 



THE transference of kinetic solar energy into potential 

 energy stored in complex chemical compounds involves the 

 necessity for the existence of collecting or preparing organs 

 in the organism by and in which the food materials may 

 be brought to it and elaborated for its use. These organs 

 are technically called organs of nutrition, alimentation, 

 digestion, or assimilation. Further, the fo^d materials 

 when prepared must be distributed to everfPpMt of the 

 organism, hence the necessity for distributing organs or 

 organs of circulation. The cells* ultimate constituents 

 of the tissues to which the food materials are 6%tributed 

 then exercise a selective action on them, and new proto- 

 plasm is integrated, thus forming a store of potential energy 

 in each individual cell. Liberation of this store of potential 

 energy as kinetic energy is afterwards effected, manifesting 

 itself in the various phenomena of life. The compounds 

 are decomposed and the energy let loose by the action on 

 the cells of a liberating energy from without, or in virtue of 

 the property of automatism possessed by the cell itself. It 

 still remains to be determined, however, how far automatism 

 is dependent on, and influenced by, external changes not 

 necessarily immediately precedent to the exhibition of au- 

 tomatism. 



The ultimate results are seen in the various phenomena 



