Abstract
Under given experimental conditions of tissue culture the nuclei of 2 rat sarcomatous tumors are much richer in the substance giving the Feulgen reaction, which is probably thymonucleic acid, than the normal rat fibroblasts. The same difference in pieces of excised tumors was the case in a gross way but when it came to direct microscopic comparison between the nuclei of individual sarcomatous cells and those of unaffected fibroblasts no noticable difference could be made out.

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