160 C. M. Warren on a new process 
gives 10-07 per cent of carbon, and 0°85 per cent of hydrogen. 
he mixture of asbestos and oxyd and chlorid of lead was remo- 
ved from the tube, and treated in the usual manner with a solu- 
tion of bicarbonate of soda to obtain a soluble chlorid. This 
operation was found extremely tedious. Even after treatment 
for more than two weeks, with occasional fresh portions of the 
bicarbonate and frequent agitation, the decomposition of the 
lead chlorid was still found to be incomplete, and the operation 
was abandoned. As this is given in the text books as a good 
process for the separation of chlorine from chlorid of lead,* I am 
led to presume that in this case the excess of heat employed 
gave rise to the formation of an oxychlorid, which is, doubtless, 
more slowly acted upon by the bicarbonate. This single exper- 
iment does not, therefore, prove that oxyd of lead may not be 
employed in this process with good results, when used for easily 
combustible substanees, and excessive heat is avoided. But it 
will, unquestionably, be found preferable to use a substance 
which will give directly a soluble chlori 
being no deficiency in the supply of oxygen, served to confirm 
the impression gained by the preceding experiment,—that chlo- 
roform could not be completely burnt in oxygen alone, but that 
a substance having affinity for chlorine would have to be mixed 
with the asbestos, at the point where the combustion takes place. 
I. Experiments with Oxyd of Zinc, mixed with the asbestos in the pos- 
terior part of the combustion tube, as absorbent of Chlorine in the 
analysis of substances dificultly combustible. 
ments was to determine whether the presence, at the pene where 
 & ent 1.—In this experiment, three grams of oxyd of 
zinc were intimately mixed in a mortar with the quantity of 
asbestos necessary to fill the space between a and 8, fig, 2, an 
that part of the tube then packed with this mixture in the usu 
manner. A simi i 
