THE ORIGIN OF LIFE. 



53 



minute, requiring the highest powers of the micro- 

 scope (four thousand diameters) to see them at all, 

 and yet they are now looked upon as having in 

 themselves all the remarkable powers of life. We 

 may perhaps even say that wherever there is a single 



FIG. i. Protoplasm, showing its reticulum, very highly magnified. 



granule there is life. By the activities of the gran- 

 ules growth takes place, by their differentiation and 

 union and by the products of their growth is formed 

 the compound vhich we have called protoplasm. 

 By their aggregation into definite groups are formed 

 the cells. The differences between cells are due to 

 the differences in their arrangements. Protoplasm 



