AN HEREDITARY TUMOR 



511 



One fly developed a tumor visible to the naked eye. Several 

 of the flies that died were fixed and prepared for microscopic 

 examination. In two of these were found abnormal tissues. 



As a control, sterile Locke's solution was injected into one 

 hundred flies free from bacteria. Of these, thirty died from the 



TABLE 1 



December 12, 1917 

 January 10, 1918 . . 

 January 11, 1918.. 

 February 1, 1918.. 

 February 15, 1918 . 

 March 23, 1918... 



May 15, 1918 



May 16, 1918 



May 17, 1918 



May 17, 1918 



May 18, 1918 



May 18, 1918 



May 20, 1918 



May 20, 1918 



May 21, 1918 



May 21, 1918 



May 22, 1918 



May 25, 1918 



effects of the ether, twenty-eight from the operation, while 

 forty-two recovered and continued to live. 



Since the injected tumor cells developed in the adult fly and 

 since tumors could be kept alive in Locke's solution and show 

 growth in the same, there is evidence that the tumor cells when 

 placed in suitable media will grow outside the body of the larva. 



