2 Miscellaneous Contributions by Dr. Hare. 



Into the cross-piece two horizontal holes are bored, and burn- 

 ed with a wire, from a common orifice, so as to enter, seve- 

 rally, other holes bored vertically, of which one communi- 

 cates, internally, with the first, the other with the second 

 vessel. The external orifice being closed, by a screw, a com- 

 munication is established between the cavities of the vessels, 

 which obviates the necessity of tubes, as in ordinary appa- 

 ratus. The second vessel, communicates with the third ves- 

 sel, in the same way as with the first. 



The hole over either vessel, which communicates with the 

 inside of the preceding vessel through the wooden perfora- 

 tion, is furnished with a tube passing downwards, a few 

 inches, so as to enter any contained liquid. The tube, thus 

 immersed in the first vessel, rises into and communicates with 

 the cavity of the globe. This globe is pressed by screws 

 against a lead plate, which it is ground to fit, so as to make 

 an air tight juncture, in the same way, as already described, 

 in the case of the vessels, below the cross-piece. 



Hence the first tube establishes a communication between 

 the globe, and the liquid in the first vessel, below the surface 

 of which its trumpet-shaped orifice reaches. The second 

 tube, communicating by means of the perforations made in 

 the wood, with the cavity of the first vessel, descends into the 

 liquid contained in the second vessel. The third tube, in 

 like manner, communicating with the cavity of the second 

 vessel, descends into the liquid of the third vessel. 



The gas, extricated from the retort, passes into the recei- 

 ver, where it deposits any condensible matter, and proceeds 

 down the tube into the first vessel. Whatever gas is not 

 there absorbed, proceeds through the diagonal perforations, 

 in the wood, to the tube in the second vessel, escaping from 

 that into the liquid. The excess of gas beyond what is there 

 taken up, reaches the third vessel from the second, as it reach- 

 ed this from the first. 



2. Apparatus for regulating the supply of a gas, by its ab- 

 sorption. 



Two open-necked bell glasses, A, B, are joined neck to 

 neck, so as to be inverted as respects each other. From the 

 cavity of the lower one a pipe leads up through the axis of 

 the upper one. The lower bell which is the largest, is situ- 

 ated within a large cylindrical vessel of glass, D, so as to in- 

 clude a jar, with a perforated stem or pedestal. Over the 



