Unity of Life 127 



do not die as a necessary eventuality. Of course if condi- 

 tions become insupportable they are killed, changes of na- 

 tural environment may bring them more or less of food or 

 of heat or light, or may introduce some new element, and 

 they may perish; or they may show the earliest phase of 

 adaptation and thus develop new varieties. But, their cir- 

 cumstances normally continuing, they continue to live in- 

 definitely, and death has in that state of affairs no function 

 and does not appear. It is under such changeless circum- 

 stances that we now find them. They are as we see them 

 today the same creatures that lived at the dawn of life. 

 They are the dawn of life able to live to all eternity. 



