22 



MICROSCOPICAL DIAGNOSIS. 



large bottle b, which is empty at first. A third glass 

 tube can be placed in the cork of the bottle c, which can be united 

 by rubber to a' U shaped glass tube partly filled with mercury, and 

 thus the amount of pressure obtained. By raising the pail the 

 water descends the rubber tubing and compresses the air in the 

 bottle b. The air is forced through the middle piece of rubber tub- 



Ptg. 7. Injecting Apparattis.' 



ing and presses on the top of the injecting mixture in the bottle c. 

 The injecting mixture is thus forced up the long glass tube, along 

 the rubber tube to the canula, and through it into the organ or ani- 

 mal to be injected. A slow and steady pressure is obtained in this 

 way, which we have found exceedingly desirably in many cases. 



The most perfect and most beautiful injections we have ever 

 made have resulted from the use of "Seiler's carmine gelatine." It 



