THE MILK INFLUENCE IN TUMOR FORMATION 323 



Additional work with first generation females has demonstrated that the 

 influence usually obtained in the milk may be transferred to some individuals 

 by the inoculation of normal tissue from young potentially cancerous mice 

 (15). This influence may be transferred through the milk to the second 

 generation mice, as expressed by their increased tumor incidence. As 

 stated, females of a resistant strain do not show a high breast tumor ratio 

 if they are nursed by high tumor strain females. Such females, however, 

 receive the "milk influence" which they in turn may pass on by nursing 

 with the subsequent development of breast cancer in animals having the 

 breast cancer constitution. 



The nature of the breast cancer producing influence has not been deter- 

 mined. That it occurs in many of the internal organs of high breast cancer 

 strain animals has been demonstrated. 



BIBLIOGRAPHY 



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