Note 30 — IV. LEUCOCYTOSIS.

That a well-marked basophil leucocytosis has not so far been observed may be thus explained. The substances which attract the mast cells are very rarely produced in the body; much more seldom than the corresponding substances attractive for the eosinophils. In morbid conditions, where substances attracting the mast cells were present, it might be possible to find a suppuration of mast cells, or a mast cell leucocytosis as well. In this connection an observation of Albert Neisser is of the greatest interest. He met with (private communication) one, out of numberless cases of gonorrhœa, in which the purulent secretion consisted entirely of mast cells.