the following pages will show, my fundamental discoveries of the nature of cancer, and of the places of the two all-powerful ferments, trypsin and amylopsin, in the treatment of this natural phenomenon, not disease, were founded in the first instance in the science of embryology. This is as true for the separate reasons advanced for the employment of trypsin and of amylopsin as it is for those urged in 1902 as demonstrating the asexual (trophoblastic) nature of cancer.* Afterwards, from 1906, the chemical evidences—the stereo-chemical ones—began to reveal themselves to the observer, who was not like that genius Pasteur, “a mere chemist,” but a practical embryologist, who had chanced to have some sort of elementary chemical education at the hands of Sir Henry Roscoe and of that pioneer of comparative physiological chemistry, the late Professor C. F. W.
* Sexual and Asexual, Sexual Generation and Asexual Generation—In animals and in plants two modes of reproduction are recognized, the sexual one, by means of germ-cells, eggs, and sperms. and the asexual by budding, which is really a process of continuous indefinite cell-division, with no eggs or sperms. In an animal or plant a sexual generation is one which bears reproductive organs, in which eggs or sperms, or both, arise. On the other hand, an asexual generation of an animal or plant is one which never bears reproductive organs, eggs or sperms. or both. but which reproduces in the way indicated above, really by cell-division. In plants the asexual generation is the flowering plant, which is capable of indefinite unrestricted increase, as, for example, a Gloire de Dijon rose or the fine white chrysanthemum. Niveus. Originally there was but one plant of each of these. The sexual generation of a flowering plant is a small microscopic entity contained within the flower. In animals all the individuals which bear sexual organs belong to the sexual generation, while the asexual generations are represented in various ways. Thus, in the sea-polypes, by the colony of polypes, while here the medusae or “jelly-fish” are sexual; in worms, starfish, etc., by what are known as larvae, while here the worm, starfish, etc., arc sexual and lastly, in the highest animals or mammals the asexual generation is present only during uterine life, as what Hubrecht termed the trophoblast. This latter used to be regarded as one of the” foetal membranes” under the name of the chorion.