The properties of the agent causing a tumor-like condition in rabbits have been tested experimentally and the conclusion reached that it is a filtrable virus. While the tumor-like condition and infectious myxoma differ markedly in their clinical and pathological pictures, they have been found to be related immunologically. The relationships of the tumor-producing virus to the virus of infectious myxoma, and of the tumor-like condition to malignant neoplasms have been discussed.

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