Influence of Bismuth on the ductility of Copper. 419 
not bear to have it touched, became so completely insensible, that it 
could be handled without pain, and the woman could faise her arm; 
the insensibility continued for three eek The operation was not per- 
formed that day. When the abscess was at its head, the chloroformic 
fumigation was renewed, and almost immediately Dr. Dubois plunged 
the knife into the abscess without any sensation on the part of the pa- 
tient; he then turned her attention from it, and after this there was no 
more feeling of pain in the region. Afterwards the small place'on the 
hese facts are strongly affirmed by two hororable physicians who 
also cite the witnesses to the operations. Other doctors have attempted 
10 repeat the experiment; but, as is singular, without success. More 
study of the conditions and may lead to new and complete suc- 
cess; and we hope toa nee such in our next communication 
Influence st bismuth on the ductility of Copper.—There has recently 
liar properties. Although of high per-centage the color is bronze ; it 
is but little ductile ; the fracture is loose and crystalline, which may be 
removed by refining according to the ordinary methods. 
. Levol, Assayer at the Mint of Paris, has analyzed this copper 
before cot after refining, with the following results: 
Crude. Refined. 
Copper, - - - 99-400000 - -  99-480000 
Sulphur, - - - 0314000 - - F 
Lead, . - - - - - 0°362000 
Silver, - - -  0-100000 - - 0-100000 
Bismuth, - . - 0-144000 - - 0048000 
Gold, - - - 0-000833 . - 0-000833 
Antimony, } - trace } - - trace 
rsenic, - - - - 
Loss, - - - 0041167 - - 0:008917 
The lead and trace of arsenic proceeded from the process of refining ; 
and it is found by experiment that the small proportion of antimony, 
arsenic, gold, sve: and lead do not explain the want of ductility 
of the copper. The bismuth, then, only one-third of which had re- 
Sisted oxydation, is the sole cause of the loss of ductility. M. Levol 
has proved the correctness of this conclusion by preparing different 
alloys. It is remarkable that bismuth which has so many points of 
important to examine for bismuth the coppers of commerce, in order 
to search out the cause of the peculiar mechanical a chemical quali- 
Hes ofien found, even in copper of excellent sid agen 
alluded to in the November number of this ane Some new facts 
have been brought out by M. Bobbierre, idea the results before 
Sascha Ay and he has established them by experiments. For the 
Purpose of experiment, he has made with metals either pure or impure, 
ingots of bronze of a a cylindrical form by castings in sand, having 
height of 40 centimeters and weighing 25 kilogra ms. Portions for 
analysis were taken from different parts of the ingot both from nie 
