Foreign Literature and Science. 193 
4. To show the effects of various acids on copper plates, 
both pure and mixed and of different degrees of strength. 
Fifteen hundred Francs 
-_ For the Subriation ser Russian Leather. —There i is oy 
n to believe that the py 
al bark, may be oe ivant 1 in this process 
It appears evident from the writi af Pallas, and others 
that Whey, and Tannin deriv ieee abecberk afte 
willow or the leaves of the Statice Limonium and the oil of 
birch bark and a yu ae teemmhes of that tree are 
vias employed in the in 1a. 
SS a 
wo 
fifteen tee Se f; 
a4atCci 
employed i in instruments for dividing soft animal and vegeta- 
ble substances, used as in domestic economy in many 
of the rural arts. Instruments used for pounding, cutting, 
—~ grating, iae.caxe shone alluded to 5 and .o! obubich 4 iron 
and steel from their n very ¢ 
or the « : ary eras ee oat vhicl os 
ed ik pater, ae capable i 
tone. Two hundred franes : 
3 For - preservation of meats He anying. Fire thov- 
“a iVeN. Tr os 
