A scientific theory certainly challenges attention when it is based on logical reasoning and is sustained by the successful results of five out of seven inoculations of animals, and by the positive findings of the biologic, prepared-serum test. All this evidence has been accumulated by George Kelling1 of Dresden, in favor of his theory that malignant tumors are due to the parasitic action of foreign embryonal cells. He shows how frequently living embryonal cells may gain entrance to the body, as, for instance, in raw or imperfectly cooked eggs, in fishes' or insects' eggs, in the food or drinking water, or they may be inoculated by the bites of insects. Reasoning from these premises, he inoculated fourteen dogs with a small amount of a suspension of hens' eggs ground in a mortar and mixed with physiologic salt solution. Seven of the animals were killed in the course of a
FOREIGN EMBRYONAL CELLS AS CAUSE OF CANCER.. JAMA. 1904;XLIII(4):269. doi:10.1001/jama.1904.02500040037011
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