EFFECTS OF RAYS OF EADIUM ON PROTOPLASM 347 



Lazarus-Barlow and Beckton. 1913 On radium as a stimulus of cell division. 



Arch. Middlesex Hospital, vol. 30. 

 LiLLiE, F. R. 1911 Studies in fertilization. I, II. Jour. Morph., vol. 22. 



1912. Studies in fertilization. Ill, IV. Jour. Exp. Zool., vol. 12. 

 MoTTRAM, J. C. 1913 On the action of beta and gamma rays of radium on the 



cell in different states of nuclear division. Arch. Middlesex Hosp., 



vol. 30. 

 Packard, C. 1914 The effect of radium radiations on the fertilization of Nereis. 



Jour. Exp. Zool., vol. 16. 

 Payne, F. 1913 A study of the effect of radium upon the eggs of Ascaris mega- 



locephala univalens. Arch. f. Entwickl., Bd. SfO. 

 Richards, A. 1914 a The effect of X-rays on the rate of cell division in the early 



cleavage of Planorbis. Biol. Bull., vol. 27. 



1914 b The effect of X-rays on the action of certain enzymes. Am. 



Journ. Physiol., vol. 35. 

 Rutherford, E. 1913 Radioactive substances and their radiations. Cam- 

 bridge. 

 Tennant, D. H. 1910. Variations in Echinoid plutei. Jour. Exp. Zool., vol. 9. 



