Abstract
Pathological and histochemical observations were made on the liver and the intestine of rabbits infected with Schistosoma japonicum and the course of the disintegration of infected parasite eggs in host tissues was traced.
PAS reaction, alkaline phosphatase and fatty yolk were observed in the cortex of the eggs undergone cleavage. Then, fatty yolk decreased remarkably in the matured eggs, while PAS reaction and alkaline phosphatase remained as before in this stage. Estimation of the disintegration of eggs is possible by the cytoplasmic structure, nerve or eosinophilic glands, or histochemically by the lipoid content and distribution in the eggs.
It is concluded that the integration of eggs is conducted not by the grade of maturity but by their enviromental eonditions in the host tissues.
