THE CELL THEORY 



255 



number — commonly from two to twenty-four — in different 

 parts of animals and plants, they are, nevertheless, of the 

 same number in all the cells of any particular plant or ani- 







wL^^m 











W 



Fig. 78. — Highly Magnified Tissue Cells from the Skin of a 

 Salamander in an Active State of Growth. Dividing cells with 

 chromosomes are shown at a, b, and c,. (After Wilson.) 



mal. As a conclusion to this kind of observation, it needs 

 to be said that the chromosomes are regarded as the actual 

 bearers of hereditary qualities. The chromosomes do not 



