NOTES AND EXHIBITS. 



519 



by means of a Bunsen filter-pump attached to the service-pipe. 

 It is very much handier than a hand-pump, and requires less 

 attention. With the Bunsen pump, one merely has to turn on 

 the water, and give an occasional glance at the pressure-gauge. 

 It also enables the operator to devote the whole of his attention 

 to the filling of the capillary tubes. With a properly constructed 

 Bunsen pump, and a good pressure of water, a good exhaust can 



Explanation of Figure. 

 A, Funnel or reservoir for holding the lymph — B, Rubber pressure- 

 tubing, pierced in ten places on the upper surface, for holding the capillary 

 tubes — C, Tube for catching overflow of lymph from tubing B— D, Clamp 

 which controls the flow of lymph to capillary tubes — D 15 Clamp to control 

 the exhaust— E, Rubber cork fitted with a piece of curved glass tubing, 

 plugged with cotton-wool — F, Clamp : through this opening, the overflow 

 lymph is withdrawn— G, Tube to exhaust, controlled by a screw-clamp— 

 H, Capillary tubes. 



be obtained in two or three minutes. When the manometer 

 registers about 680 mm., open clamp T> 1 for about 10 seconds, 

 and then close it : next open clamp D : the lymph from A will 

 now rush in, and fill all the capillary tubes to within ^ inch of 

 the ends. By keeping clamps D and T> 1 both closed, the filled 



