6/27 In smallpox, not infrequently, the disease extends from the mother to the foetus, and the child may die of the infection or be born at term with the scars resulting from the disease upon it. Syphilis in the mother in an active stage is practically always extended to the foetus. We have said that in an infectious disease substances of an injurious character are produced by bacteria, and such substances being in solution in the blood of the infected mother can pass through the membranous barrier and may destroy the foetus although the mother recovers from the infection. 22 .-- DIAGRAMMATIC REPRESENTATION OF THE PROCESS OF FERTILIZATION. (Boveri.) In the first cell (_a_) the ovum is shown in process of fertilization by the entering spermatozoon or male sexual element. |