Abstract
The author's results by his examination of serial slides from 93 palatine tonsils of the fetus (from the second to the tenth embryonal month) as follow:
1) The paratine tonsil has its Orizin in the second embryonal month already, and its development completes at the end of the third embryonal month.
2) The follicle appears at the end of the third month.
3) In the adenoid tissue of the palatine tonsils in the 3rd and 4th embryonal month, the lymphoblast and reticulo-endothelial cells are found. The follicle is made up of lymphoblasts chiefly and a few reticulo-endothelial cells.
The extra-follicular parenchym consists of a large number of reticulo-endothelial cells and a proper number of Lymphoblasts. In the fifth embryonal month the little lymphocyt appears in the adenoid tissue.
4) Till the nineth embryonal month, the flow of the Lymph and the wandering-out of the lymphocyt on the surface or in the lacuna of the palatine tonsils of the fetus are not yet seen, but in the 10th embryonal month these are found.
From the facts above noted the author concludes that the palatine tonsills have to begin their function in the 10th embryonal month.
