British Asso ati ; for the A " * | , . t of Si 24 . ne 301 
A paper by Dr. Andrews, was read, on the influence of Voltaic 
combination on Chemical action, He endeavored to show that 
the proper tendency of a voltaic circle is to diminish the chemical 
action of the solution on the’electro-positive metal, from the con- 
‘sideration, that in-ordinary solution, the dvolticities thus devel- 
oped have only an indefinitely small portion of liquid to traverse ; 
while in voltaic solution their reuhion ¢an be éffected, only by 
passing across a column of variable extent, = pe cm of an 
imperfectly conducting substance. 
_ Mr. Robert Mallet read his report of the experiments ftiétitated 
at the command and with the funds of the Association, “ On the 
action of Sea and River Water, whether clear or foul, and at va- 
rious temperatures, wpon Iron, both cast and wrought,” and made 
by himself and Prof E. Davy, of Dublin. The report is compris- 
-ed under four principal sections, viz. . 1. A brief summary of the 
actual state-of our chemical knowedge of the reactions of air and 
water on iron.’ 2. A statement of the nature and extent of the 
experiments on the action of water on iron, which have been. 
made on the great scale for the use of the engineer as well as 
chemist. 3. A refutation of the method proposed by J. B. Hart- 
ley, of preserving iron by brass. 4. A new method, founded on 
electro-chemieal agencies, for the protection of wrought and cast 
iron ; with a statement of various desiderata upon the subject. 
A paper was ‘presented, by Mr. Robert Addams, On the con- 
struction of Apparatus for solidifying Carbonic Acid Gias in con- 
tact with the liquid form of the Acid, at different temperatures. 
Mr. A. adverted to the original production of liquid carbonic acid 
by Dr. Faraday, in 1823, and also to the solidification of the acid 
-by Mr. Thilorier, and then exhibited three kinds of instruments 
which he (Mr. A.) had employed for the reduction of the gas into 
the liquid and solid forms. “The first mode was mechanical, in 
which powerful hydratlic pumps were used to force gas from one 
vessel into a second, by filling the ‘first with water, saline solu- 
tions, -oihor mercury ;- and in this apparatus a gauge of observation 
is attached, in order to see when the vessel is filled. The second 
kind of apparatus is a modification of that invented and used by 
“'Thilorier. ‘The third includes the mechanical and the chemical 
“methods, by which is saved muclr of the-acid formed in the gene- 
‘rator; whereas by the arrangement of Thilorier’s plan, two parts 
in thrée tush into the atmosphere and are lost. With this set of 
