Chapter 3 



INTRACELLULAR CHANGES 57 



A brief historical survey. Changes in protoplasm. Changes in 

 the chondriosomes and plastids. Changes in the nucleus. Cyto- 

 logical investigations performed in the electrobiological laboratory 

 by the author and her co-workers on rye, peas, and wheat. The 

 significance of intracellular changes for increases in yield and 

 the obtaining of new species. Polyploidism. 



Chapter 4 



THE EFFECT OF THE QUANTITY AND QUALITY 



OF THE RAYS ON THE TRANSFORMATION OF PLANTS 97 



Differential sensitivity of organisms to X rays. Biological 

 dosimeters. Retention of the action of X rays. Natural radiation 

 and cosmic rays. 



AUTHOR INDEX 117 



SUBJECT INDEX 119 



11 



