COLLOIDS, OR THE MATERL\L OF LIFE 129 



remains unsolved. Yet every day we see the change brought 

 about by the agency of plants and animals. We know that 

 the chemical reactions which take place in living matter do 

 not differ in principle from those in dead matter. It cannot 

 reasonably be predicted, therefore, that the sjTithesis of living 

 organisms is impossible. The study of colloids encourages the 

 hope that eventually the mj'stery of life may be solved. 



