132 THE ENZYME TREATMENT OF CANCER
like twins. The facts concerning these, as well as those relating to Hermann von Jhering’s finds in the armadillo (Praopus hybridus), which my work has fully confirmed, furnished the key. This armadillo, the “tatu,” produces all its young in one chorion or trophoblast, and therefore they are all identical, of the like sex, and all products of one egg. The whole doctrine of the tumours, benign and malignant, centres in the phenomena of like twins—that is, in a former multiplicity of embryos, all products of one egg. To-day the “tatu” (P. hybridus) produces seven to twelve such, all derived from a single egg, all of the like sex, and some of them more or less rudimentary!
These latter tell a very significant story* to the embry-
* Because hypothetical, the following may find a place as a foot-note. From the consideration comparatively of a variety of embryological phenomena, well known to the investigator, it is obvious that the procedure, where only a single embryo is going to arise from one of the primary germ-cells. will not be quite the same when two or more embryos are destined to unfold. The setting apart of one cell will be preceded by one or two divisions, giving one functional cell and possibly three abortive ones. But if the development shall result in, say, triplets, there will be, not merely two divisions, but at least three, if not four. Of the products, which are all primary germ-cells, three will unfold as embryos, three may be abortive or rudimentary, and, if there be eight all told, two will remain as “embryonic cells,” which later on, in some or other of the individuals arising, may become the seed of tumours, benign or malignant. But these cell divisions have a curious tendency to be in twos or pairs, or even in threes; so that in the formation of triplets, instead of eight cells, there may be sixteen concerned. How many of these will be abortive, and how many “embryonic” in potentialities, is at present impossible to say. The armadillo, Praopus hybridus. with its seven to twelve young in one chorion or trophoblast, affords an instance where at least sixteen cells must originally in every case have arisen at the line of primary germ-cells and in addition to those cells destined to become the sexual products. Of these sixteen cells, seven normally give rise to fully-developed embryos, five to more or less rudimentary ones, and there still remain four, which—as cancer, is not known here—may be abortive.