208 



TRANSACTIONS OF THE 



The operation of this instrument is as follows : Immerse the 

 end of the eduction tube in the enema, compress the bulb with 

 the hand, which will expel the air from within, then releasing 

 the grasp, the bulb will recover its form by virtue of its 

 elasticity, and the partial vacuum thus formed will be filled 

 by the enema. Now insert the injection tube, and repeat the ope- 

 ration of compressing the bulb until the required quantity of the 

 enema is administered. We prefer the spheroidal shape for the 

 bulb, as with that shape a better effect is obtained from the grasp 

 of the hand than with any other. Tlie prolate spheroidal form of 

 sac, is the one best adapted to produce the greatest effect from the 

 grasp of the hand, by whicli this instrument is operated, by so 

 combining it with the tube and valve boxes that they shall be in 

 or nearly in the greatest axial line of the sac, the fluid is passed 

 through the instrument in the most direct manner, and with the 

 least loss of effect possible by friction. [A diploma awarded. 



Lymaii's Dry Refrigerator. 

 A. S. Lyman, 212 Second avenue. New- York. 



The ice is placed in the cham- 

 ber A, and the air in contact with 

 it being cooled and condensed, 

 and therefore rendered heavier, 

 flows down through the grate R, 

 and the descending cold air flue 

 . C, in the direction of the arrows. 

 I It is discharged up through the 

 j opening in the back part of the 

 bottom of the lower drawer. 

 The warmer air in this drawer 

 rises up through the opening M, 

 in the division board above and 

 onwards, finally passing up the 

 flue D, and over again upon the ice. Thus a current is formed, 

 as shown by the arrows. 



For the purpose of showing more clearly its internal arrange- 

 ment, the middle drawer is represented as partially open. This 

 shows the opening M, through the division l:)oard, on which that 



