= 
we 
7 ee 
396 Foreign Literature and Science. 
of this salt was so abundant, that several pieces detached 
from the walls of the house weighed near a kilogramme, 
2ilb. With proper avention, ~ collection of it might certain- 
ly be rendered lucrative. e proceeds the hydro- -chlo- 
ric acid of this iaisiohaed sah? This question it does not 
seem easy to resolve ; but one thing is certain, all the water 
of the coal pits of St. Etienne contains among other salts a 
notable quantity of hy dro-chlorates with earthy bases. 
. Fa a@porisation of Ether. —Cagoiard de la Tour has 
ieee » y-eXperiment - Ether is susceptible of being re- 
| tovapour in a space less than double its primitive 
Estes ‘alcohol in ties than three times its volume. 
ese cases the former exerts a pressure equal to 37 
or + #etatinospheres, and the latter, a pressure equal to 119 
atmospheres. To effect such a vaporisation ether must be... 
heated to 320° F. and alcohol to 405° F. 
Paper Hangings.—To uard against the effect of 
§ 2189. ap 
dampness in the injury and destruction of paper hangings, a 
method has been adopted in London which proves to be 
very effectual. Very thin sheets of Lead are fastened to 
the walls by copper tacks, and to this the paper is pasted 
without any difficulty. ‘The lead is as thin as the sheet used 
in the lining of tea boxes, and effectually excludes the mois- 
ture of the wall 
40. Brick-making.—A patent or privilege has been ob- 
tained at St. Petersburg fora press for making bricks, which 
is not only to diminish the labor, but to perfect the forms of 
the bricks. means of this machine, not only bricks, 
both solid and hollow can be made, but tubes straight or 
crooked, cornices, flutes for ouldiiis and other arghioets 
‘tural ornaments. The patentee isa M. Chomas who pro- 
poses to establish a model brickyard with improved ovens 
for baking the bricks. Three or four men can produce, it 
is said, with this machine from 10 to 12 nee — 
daily, of different forms. 
Lei, ipsic.— The number of students attached to the 
acvicey of Lei eipsic, during the Jast winter session was 
1102, of whom 480 applied themselves particularly to the- 
