SUBJECT INDEX 



593 



X rays, genetic effects of, factors alter- 

 ing, 447 

 on growth of fungi, 443 

 indirect, 292, 294-296 

 inheritable, 311-313 

 lethal, 286-290, 292-294. 319 



in fungi, 444 

 miscellaneous, on protozoa. 316-322 

 on mutation in fungi, 444 



X rays, variation in sensitivity to, 291, 

 292, 304. 305 



Zea mays (maize), 249, 253-255, 258- 



268, 270, 273-277, 279-280 

 Zi/yorhynchus molleri, 443 

 prior anus, 433 



