THE CELL THEORY 



255 



number commonly from two to twenty-four in different 



" 9 



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

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



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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, 6, 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 



