| Abstract: | When a chick embryo, deprived of its hypothalamo-pituitary complex by partial decapitation, is bearing a grafted hypophysis, this gland is unable to induce a normal development of the thyroid. The volume of this gland is reduced and, consequently, the fixation of iodine is decreased from the age of 16 days. Some authors think that there are no hypothalamo-pituitary correlations in the chick embryo. On the contrary, these observations lead to admit their appearance towards the end of the incubation. |
