Separate Accounts have not been published. 489 

 another evil belonging to it is, that after a few strokes of the 

 piston, the air confined above it forces out the water at the 

 upper end upon the hand of the operator. In Mr. Read's 

 Syringe these defects are remedied. The whole is made 

 of brass, the tube being very accurately drawn. Two caps 

 are made to fit the top of the tube. One is shewn at Fig. 

 I, a. a. screwed on to the tube and more enlarged at Fig. 2. 

 The other is represented at Fig. 3. In the socket attached 



if " 



to this last cap, is a ball acting as a valve b. which rises the 

 moment the lift is made, and allows the water to rush in freely 

 at the aperture c. The full lift having been thus easily and 

 quickly made, the moment the piston begins to descend the 

 ball closes the aperture c. and the water is driven out in a 

 vol. y. 3 S 



