Abstract
I - In 5 hypophysectomized rats the curve of body weight was observed: the changes from the 10 th to the 30 th day after operation were unsignificant.
II - 30 hypophysectomized rats were inoculated with Walker carcinoma and 30 normal rats were likewise inoculated and kept as controls. No statistical valuable difference in the positive taking of the transplants was observed.
III - Tumor growth (measured by the weight as well as by the volume of tumours) was reduced by about one third in the hypophysectomized rats in comparison to the controls: a positive influence of the hypophysis on tumour growth may be admitted.
IV - The hypophysis is not essential for the taking of the transplant, but exerts an influence in the following growth period.
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