242 REFERENCES 



reproductive functions of white rats associated with daily- 

 exposure to nicotine. Jour. Pharmacol. Exper. Therap. 87, 

 1-10 (1946). 



58. TOUGH, I. M., K. E. BUCKTON, A. G. BAIKIE and 

 W. M. COURT-BROWN. X-ray-induced chromosome 

 damage in man. Lancet 2, 849-51 (1960). 



59. VIELMETTER, W., and C. M. WIEDER. Mutagene und 

 inactivierende wirkung salpetriger SJiure auf freie Partikel 

 des Phagen T2, Z. Naturf. 14b, 312-17 (1959). 



60. VILLEE, C. A. The Placenta and Fetal Membranes (Balti- 

 more: WilHams and Wilkins, 1960). 



61. ZAMENHOF, S., G. LEIDY, E. HAHN and H. E. ALEX- 

 ANDER. Inactivation and unstabilization of the transform- 

 ing principle by mutagenic agents. Jour. Bacteriol. 72, 1-11 

 (1956). 



62. ZETTERBERG, G. The mutagenic effect of 8-ethoxy- 

 caffeine, caffeine and dimethylsulfate in the Ophiostoma 

 back-mutation test. Hereditas 46, 279-311 (1960). 



