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<h3>DIET, DUCTLESS GLANDS AND TUMORS</h3> In commenting on the relation of nutrition to the growth of transmissible tumors<sup>1</sup>we referred in some detail to the recent investigations of Sweet, Corson-White and Saxon<sup>2</sup>in Philadelphia. They concluded from their experiments that: (1) the susceptibility of rats and mice to the transplantable tumors may be influenced both positively and negatively by proper diets; (2) the rate of growth of the transplanted tumors can similarly be influenced; (3) castration of the male renders the animal more receptive to the transplant, and the rate of growth of the tumor is increased. Several years ago Hunt<sup>3</sup>described the influence of certain drugs and diets on the activity of the thyroid glands. Some of the substances were believed to stimulate, others to repress the gland functions. Reasoning that the influence of diet may be exerted through the ductless glands, the Philadelphia investigators attempted tumor was