for the Analysis of Organic Bodies. 233 
Fig. 5, shews the foil in act of being wrapped on, also the pro- 
portion of the space occupied by the materials; first the mixture 
of oxide of copper with the material to be analyzed, next pure 
oxide of copper, or copper filings, and lastly asbestos. When the 
quantity of water formed is considerable, the tube is either 
blown into a bulb, as at &, fig. 6, or melted on to one ready pre 
pared. 
Fig. 7, is a long funnel, made by drawing out the end otf a tube 
of suitable thickness at m, till it is long and small enough through 
n n to reach to the bottom of the tube, and then cutting it off at m, 
by which liquids may be introduced to the bottom of the tube 
without soiling the sides. . 
. As the wicks nearest the trough are to be first lighted, and the 
remainder in succession as the former finish their action, there are 
upright supports of tin oo fixed on the lamps, one for each space 
between the burners, against which to rest a slip of tin pp, to pre- 
vent the lighted wicks from kindling those next, and it also enables 
the experimenter to extinguish those which have done duty. In 
fig. 2, the tin slip p p is shewn by dotted lines reaching from lamp 
tolamp. Little flat caps are put on each burner when done with, to 
prevent waste of spirit; fig. 8 shews one of these caps q in its 
place. r7,fig. 1, is a shelf fixed to the mercurial trough, to hold the 
lamps; ss, the graduated jar. The pipes, with corks, w w, fig. 2 
are the apertures by which the spirit is poured into the lamps; their 
places only are marked at w w, fig. 1, The whole of this appa- 
raius is made of tin plate. 
At first Mr. Cooper operated with a tube of one piece; and the 
materials being put in when the tube was straight, it was afterward 
heated and bent at the open extremity, so as to suit the mercurial 
trough; but this has been improved upon by making the tube 
shorter and having a bent piece, attached to it by a small flex- 
ible tube of caoutchouc, f, fig. 1. It removes the chance of accident 
from stiffness in the end of the tube, and the tubes being straight, 
may be used many times in succession, 
Mr, Cooper has also used with advantage, at times, the form of 
