Abstract
The author reports the following results of his histological research on the stroma of the palatine tonsils of the fetus.
1) The lattice-fibres of the fetal palatine tonsils, which are able to strain black at the beginning of the 3rd embryonal month, are arranged uniformly as a net-work in the parenchym tissues, and divide the parenchym tissues into many sections containing one or several cells.
2) Very few or sometimes none of the lattice-fibre are seen in the folliculs after the end of 3rd embryonal month.
3) In palatine tonsils there are a few lattice-fibre under the mucosus layer, but none of them are seen in the place where corresponds to the tonsilar capsuls.
4) The elastic fibres appear in the submucous tissues, and in the parenchym adjacent to the submucous tissues in the 3rd embryonal month. In the 4th embryonal month they appear in the tonsillar capsuls and in the parenchym adjacent to them. They make uniformly a net-work in the parenchym in the 6th embryonal month. In the folliculs, however, only a few or none of elastic fibres are seen.
5) The collagen fibres appear in the tonsillar capsuls and the submucous tissues in the 3rd embryonal month. A few of them are seen as fine lines or loose net-works in the parenchym of the tonsillar capsuls in the 3rd and 4th embryonal month. After 6th embryonal month they proliferate in the parenchym, but in the folliculs only few of them are seen.
