Abstract
Using spread-preparations stained with toluidine blue buffered at pH 3.2, the mast cells in the peritoneum and mesentery of adult Triturus pyrrhogaster (Boie) were observed.
1. Inside the capillaries, there are mainly the mulbeery-form mast cells filled densly with bluish purple granules, and the occasional immature mast cells in which both metachromatic and orthochromatic smaller granules are loosly mixed.
2. Outside the capillaries, there e x ist, besides the same sort of mast cells as seen inside the capillaries, other large mast cells in which granules are bigger and reddish purple and occasionally some of them are dispersed out of the cell bodies, and few remarkable dendrite-type specific mast cells.
3. The latter extend the l o ng dendrite-like, snaked processes filled with smaller, metachromatic granules in all directions, and tend to anastomose each other to form an extensive network. And they are distinguished from the ordinary type mast cells not only in their shape but also in the size and stainability of the nuclei and the size of the granules.
4. The mast ce l ls seem to be the ones which emigrated from other regions by the capillaries and were full growth there.
