320 



Contributions to the Biochemistry of Growth. 



require less protein, and in the preceding paper we have been unable to find 

 any evidence in favour of the assumption that tumour cells have a higher 

 affinity for the material necessary for the building up of new tissue. 



If the significance we attach t(j the relation between the diminished 

 nitrogen-content and the rapidity of growth of cancerous tissue is justified, 

 the same relation should hold good not only for the tissues of a malignant 

 new growth but equally well for any other rapidly growing tissue. In a 

 former paper* we have pointed out the similarity which exists between the 

 growth of cancer and the growth of the foetus, and, in fact, preliminary 

 experiments by Dr. J. Lochhead have shown that the tissues of the foetus 

 have a lower nitrogen percentage than those of the maternal organism. 



The observations are being extended to a series of transplantable tumours 

 of all grades of rapidity of growth and varied degrees of liistological 

 differentiation. 



The expenses of this research have been defrayed by a grant from the 

 Moray Kesearch Fund of the University of Edinburgh. 



* Cramer, " The Gaseous Metabolism in Rats inoculated with Malignant New 

 Growths," 'Third Scientific Report of the Imperial Cancer Research Fund,' 1908, p. 427. 



