408 Correspondence of J. Nicklés. 
Galvanism.—A modification of Bunsen’s battery is proposed by M. 
Guignet, consisting in replacing the nitric acid by a mixture of peroxyd 
proceeding from the decomposition of water. The process is recom- 
mended : but it is of too recent introduction to have been fairly tried. 
yautier communicates a fact of quite a different kind.. He has 
obtained some sulphuric acid by exposing a mixture of air and sulphur- 
ous acid to the luminous arch produced by a powerful battery. To 
succeed, the points of the battery should be of platinum. 
r. Amussat presents the results which he has obtained with the use 
of a galvanic battery in therapeutic surgery. With a platinum wire 
heated to a high temperature by means of a strong battery he has had 
complete success in the caulerization and removal of tumors. The 
wire should be incandescent, but must be used with caution, as at this 
temperature it is easily broken off. 
Machine with Vapor of Ether.—The steamboat, Du Trembley, has 
un engine adapted for the use of the combined vapors of water and 
ether. The object of the ether is said to be to retain and utilise the 
heat lost by the sieam, and employ it in forming a second vapor whose 
force shall be added to that of the steam. 
The following is the process employed by Du Trembley, the inventor. 
The facts here given are from a report signed by an administrative 
commission which examined the invention during the first voyage m 
by the vessel between Marseilles and Algiers. The vessel is of a size 
to carry 100 passengers and 230 tons of merchandise. 
In order not to lose the heat which the steam retains after employing its 
expansive force, M. Du Trembley receives the spent stearn in a close 
above takes place ; the water is condensed and the ether evaporates. 
In condensing, the water produces a vacuum which adds to the ex- 
encountered ; and the ether vapor, collected ina separate compartment 
in which the tubes terminate above the vaporizing apparatus, then con- 
tributes a new force which is added to that‘of the steam. 
The condensed water is collected again in the boiler whence it had 
gone out as steam, carrying back as much heat as the ether had left 
after its vaporization. 
he ether vapor which is collected above the vaporizer and the 
tubes in which it is formed, is taken into a cylinder specially adapted 
to it, but every way similar to that for the steam. The piston of the 
second cylinder can act either independently, or may connect witht 
am as that of the cylinder for the steam ; in the latter case, the 
two vapors are combined in the same work, as takes place in the vessel 
in applying this 
Du Trembley, and which must always be the case 
system to navigation. i xs 3h eee 
eget 
