First Parents. 15 



Thus each tissue in Hving things is built up of 

 numberless cells of protoplasm, and in each tissue 

 the cells have a characteristic shape, some of which 

 are portrayed at the bottom of the page. 



Sometimes, however, protoplasm exists without 

 any definite form, and has thus been found, a mere 

 layer of slime, at the bottom of the sea. 



Again, a cell of protoplasm may exist by itself, 

 not united with other cells to form a tissue. Where 

 it thus exists it sometimes has no cell-wall, is but 

 a speck of protoplasm, living its little life in the 

 water, often too tiny to be visible to the naked eye. 

 Yet this little single cell of protoplasm is as truly 

 a living creature as is a kitten or a bird. For 

 some reason in the one case, countless numbers 

 of cells congregated together and built up a kitten 

 or a bird; while in the other case, there was no 

 such building up; the single cell was destined to 

 live alone. 



It takes many tissues and countless millions of 

 cells to form the organs of the kitten or the bird 

 and enable all their various functions to be per- 

 formed. Then how does the creature 

 possessing but one cell survive? For we 



know that every living thing must [, 



S 





M^v 



