

HEREDITY 



I J i . • struggle for existence ia portrayed by the meadow mouse, sur- 

 rounded by its many enemies and yet continuing to main- 

 tain .'in existence by virtue of its greal birth-rate. 

 The simpler features of the laws of Heredity as elucidated by Mendel 

 and his followers arc illustrated by the inheritance of 

 d-coal color in the common pea. the color of sweet 

 peas, and i he coat-color of rats. 



Ri I nm to lln < h vators and ascend to the second floor. 



Struggle for 

 Existence 



Heredity 



ENLARGED MODEL OF A RADIOLARIAN 



