14 INTRODCCHION. 
cheap and serviceable substitute. These latter can be 
obtained from Whitall, Tatum & Co. of Philadelphia, 
of different sizes and at very small cost. The best 
size to use for the dog is one holding six or eight 
ounces. Before using this syringe the piston must be 
left in water for some time to swell, otherwise it will 
not work tight in the barrel; though if left too long in 
the water the trouble will be in the other direction. 
The method of using the syringe in injecting is de- 
scribed in Chapter IV. 
