146 Prof. J. Emerson-Reynolds on the 



glass tube C. The heat afforded by a spirit-lamp suffices for 

 bending these tubes from straight pieces, and for the conversion 



Fig. 1. 



of an ordinary bulb-pipette, capable of holding rather more than 

 one fluid-ounce, into a vessel of the form B. 



The delivery- tube of the pipette is first passed through the 

 remaining hole in the cork, and the end of the tube then drawn 

 out and recurved, as shown at c ; the tube above b is bent so 

 far down as to admit of its being connected by means of an 

 india-rubber tube with the outer extremity of C. At D the 

 india-rubber tube is securely clipped by a small artery-forceps 

 with broad jaws. When the cork carrying the tubes just 

 described is secured in the bottle, the generating- vessel is 

 complete. When an estimation is in progress the bottle A is 

 placed in a tumbler, T (or beaker), containing cold water at a 

 temperature of 52° F., as nearly as possible. 



The Gas-receiver-. — This is easily constructed from a large 

 pipette whose bulb F is capable of containing about three fluid- 

 ounces. The tube /is cut off so as to admit of being securely 

 joined to the tube E of the generating-vessel by means of an 

 india-rubber connector. The delivery-tube is then bent, as 

 shown, and at the point H a little hole is made. A groove 

 cut in a block of wood g receives the bent tube of the little 

 gas-holder, which is then easily secured in its place by any 



