THE MAST CELLS 



♦ 



Fig. 45 



The " explosions " are due to the action on the mast cells of sodium hydroxide, 



liberated at the cathode. Here a weak solution of sodium hydroxide (arrow) 



is being run under the cover-slip of a fresh preparation. Note swelling and 



disruption of the mast cells, as before ( . 950). 



120 



