THE MAST CELLS 



Table IX 

 Histamine and heparin values in ten further cases of mastocytoma in dogs 



* This small tumour was sent wrapped in a formalin swab; the histamine content falls rapidly 



in such conditions. 

 ** N.A. (not available): the container was accidentally broken in the post. 



Table X 



Histamine and heparin values for various tissues obtained post-mortem from 5 dogs with mast-cell 

 tumours (numbered as in Table IX) compared with normal controls 



(* Skin adjacent to tumour) 



86 



