86 THE ENZYME TREATMENT OF CANCER
pletely differentiated sterile Metazoan or higher animal organism, which, starting by the abnormal development of a vagrant primary germ-cell, and growing under conditions unfavourable to the complete and normal differentiation of all its parts, unfolds and develops those things, for whose growth the nidus is suitable, the rest degenerating. And, exactly as identical twins are the offspring of two sister or brother germ-cells, identical in ancestry from the same primitive germ-cell, and identical in all ultimate characters, so also any higher animal, and a tumour within it, stand in the same relations of ancestry from one primitive germ-cell, have the like ultimate characters (identity) at the starting-point of their development; but, unlike fully-developed identical twins, the individual and its tumour develop in different directions: the one upwards along the track of higher and higher organization, the other downwards, along the roadway of abnormality, of degeneration, of arrest, even at times—when the asexual generation is represented— of riot, destruction, and disaster.
The highest tumours, then, are (1) the cystic embryomata. On these follow (2) the solid embryoid or teratoid tumours of the ovary, containing skin, gut, and “mesoderm,” and derivatives of these. (3) The less highly developed ones of the testis. Like the foregoing, these are “three-layered,” the skin is scanty, they contain gut and trachea, the heal-region is rudimentary, and their growth is unlimited. Borst has recorded in them ganglion cells and sympathetic ganglia. (4) Teratoid tumours, where the “embryonic” tissue is mainly sarcomatous (cancer or asexual generation). (5) Teratoid tumours of the testis with the epidermal layer lacking. (two-layered tumours of Wilms). These teratoids lead to (6) the more complicated sacral and parotid tumours, and