THE MAST-CELL GRANULE 



«*'.. 



Fig. 46 



Ammonia, the simplest of amines, is an efficient though non-specific histamine- 



liberator. Living mast cells in this preparation of exteriorized rat mesentery have been 



sprayed with ammonia vapour, then fixed and stained as a tissue spread. The swelling 



and disruption of the mast cells are clearly visible (x 700). 



121 



