76 METHODS OF MICROSCOPICAL RESEARCH. 



from 4 to 5 inches, it will be found that the animal 

 is completely injected. The head must be examined 

 from time to time, as already described, so that the 

 rising colour of the lips, gums, tongue and eyes may 

 be watched. The animal is now removed to cold 

 water, and treated as directed above. 



This method of applying pressure is wonderfully 

 delicate and equable; it will be found that whilst 

 the mercury in the manometer can be raised almost 

 imperceptibly, one entire compression of the barrel 

 of the syringe raises it 1 inch. 



