16 PROFESSOR CONNELL ON A 
B is a small mercurial thermometer, the bulb of which reaches within 3 of an 
inch of the bottom of the bottle, and the upper part of the bulb is on a level with 
the surface of the liquid contained in the bottle, or a little above that level. The 
bulb ought not to be entirely immersed in the liquid. Its shape is an elongated 
cylinder, about 3 inch in length, and about }in diameter. The thermometer has 
a small scale attached to it, graduated according to both FanRENnuEIT’s and CELsIus’ 
scales from 0° F.to 100° F. The stem of the thermometer is cemented at C into a 
little brass stopper, fitted by grinding into the neck of the bottle, so as to be per- 
fectly air-tight. DE is a small exhausting syringe of brass, the cylinder of which is 
5 inches long, by about 7 inch wide. It must effect its purpose of exhausting in as 
perfect a manner as an instrument of that size can accomplish. FG isa clamp of 
brass, capable of being attached by the screw horizontally to a window-sill in the 
position which it occupies in the figure, or vertically to a common table, the holding 
surfaces which come in contact with the body grasped being well roughened. 
The syringe screws into this clamp at K by a projecting screw soldered to the 
former, when the clamp is screwed to a window-sill, as in the case when an ob- 
servation is made at an open window; or this projecting screw is inserted at L, 
when the clamp is fastened to a table, as is done when the experiment is made in 
a room. In both cases the syringe itself occupies a horizontal position, and 
the bottle and thermometer, of course, a vertical one; the projecting screw K 
should be so constructed as to cause the syringe to incline with the bottle a little 
downwards, that the tendency of any ether to pass from the bottle into the 
