54 THE ENZYME TREATMENT OF CANCER
inquiries, dating as long ago as 1888, cannot be given at all in detail here. A general survey of the chief conclusions will be found in “ Heredity and the Epicycle of the Germ-Cells.”* The nature of cancer is really known, but not recognized. Failure to perceive the true nature of carcinoma has hitherto been due to one simple fact the views generally—nay, universally—held regarding the course of the cycle of development from egg to egg are erroneous.
Were an embryologist of to-day asked what in outline was the cycle of development in one of the higher forms— say a fish, chick, or mammal—he would probably be amazed at the question. “ The hen lays the egg, the latter gives birth to a new hen, and so, as Kleinenberg once remarked of something else, under the eyes of the delighted and astonished spectator, the cycle is completed. This supposed cycle has never really been witnessed, for the very good reason that it does not exist. The hen neither produces the egg, nor is it the chief, nor even the immediate task of the latter to give rise to a new hen. As the establishment of this and of the true life-cycle have filled in the working hours of the writer during many years, it may be obvious that the production of the evidences must be beyond the limits of this book. Indeed, no attempt will be made to prove here what the true life-cycle is, and wherein its details lie ; the results of previous work will be assumed, and for fuller information the reader may be referred to the original memoirs.
In the higher animals—the Metazoa—what is termed “direct development “ does not, and cannot, exist. It has been found that the cycle of animal development, even of the highest forms, resembles very closely that of
* Biologisohes Centralblatt, 1902, vol. Xxii., pp. 321-328, 353-360, and 398-408.