CAUSE OF HEREDITY 267 



without the microscope. In the same manner we do not 

 need to know who built man in order to know who built 

 railroads, skyscrapers and ships. It is not material to the 

 question of the cause of heredity and development, to 

 know who built the cell. 



If we find that this microscopic animal is the builder of 

 all these things, then the only question is, why is it that 

 one cell will produce this structure, and another cell, 

 which looks just like him, will produce one entirely differ- 

 ent? When we consider that he is a living animal just 

 like ourselves, and just like the thinkers in our head, we 

 need only ask, why do some men build sod houses and 

 some skyscrapers, and why does a squirrel build in trees, 

 and muskrats over water? The answer is plain one 

 knows how to build one kind and the other, another kind. 

 It is simply a matter of education and experience of the 

 cells. Mr. Walker states: 



"Every part that is alive of an animal or plant consists 

 of cells and of nothing else. There are parts of the bodies 

 of animals and plants that are not composed of cells, but 

 these are not alive. The hard parts of the bones in man 

 are an example of lifeless substance within the body. 

 Such dead material, however, has been produced by cells, 

 which form a part of the animal or plant during its life." 



Investigations have shown that a person will inherit 

 the same shaped bones or frame-work as his parents. 

 Bones are not alive they are only the structure built by 

 the cells from lime and other material to serve as the 

 frame or supporting structure. The cells station them- 

 selves here and there in the bone with the purpose of 

 keeping them in repair. The following by Chas. Walker 

 will start us in the investigation of the cell a little more 

 in detail: "All the multicellular organisms commence 

 their existence as single cells. This single cell divides 



