10 



THE farmer's veterinarian 



centered the development of new cells or reproduc- 

 tion — for the changes that convert the mother-cell 

 into offspring-cells are first noted in this place. 



So much for plant cells. Is this principle dif- 

 ferent in animals? For a long time it was thought 



HOW A CELL divides 



The simple steps in cell division are pictured here. Start- 

 ing with a single cell, growth and enlargement take place, 

 ending finally in ceil division or the production of two 

 individual cells. 



that plants and animals were different. But upon 

 investigation it was discovered that animals were 

 comprised of cells just as plants. And not only 

 was this discovered to be true, but also that animal 

 cells corresponded in all respects to plant cells. 

 Hence in animals are to be found cells possessing 

 the cell walls formed of a rather thick membrane, 

 the granular protoplasm or yoke, and the nucleus 

 established in the yoke. 



