Foreign Literature and Science. 189 
‘This powder is said to answer the purpose intended by th¢ 
jewellers, but it is justly observed, by M. D’Arcet, in a note 
to Casaseca’s paper, that the proper authorities will doubtless 
adopt some administrative measures to oblige those who. pre- 
pare, sell, or employ the new composition, to use every pre- 
caution in preventing a mixture which contains so much ox- 
_ide of arsenic, from ae dangerously extended as an arti- 
cle of commerce.—Ide 
6. Strength of leaden pipes. —Experiments made by M. Jar- 
dine, of Edinburgh, to determine the strength of leaden pipes, 
proved that a tube 13 inch in diameter and 3 in. thick, would 
and at 600 pounds to the square inch, or 43 atmospheres, 
was ruptured. Another tube, 2 2 inches diameter, same fisckc 
ness, sustained 25 atmospheres, and burst with a pressure of 
e method employed, was to close the tube at one 
end, and apply a forcing pump at the other. Idem. 
. Titanium. ae Cubic crystals of this metal, precisely sim- 
ilar to those Dr. Wollaston has described, have been observed 
in the high furnaces of Baden, m the scoria of a high furnace 
at Madgesprung, and in the scoria of many forges in Germa- 
ny. Until recently, these cubes have been taken for iron 
pyrites. Idem. 
8. Progress of mutual instruction in Denmark.—Second 
Report made to the King, the 28th of January, 1825, by J. 
Abrahamson, aid-de-camp of his Majesty, &c. 
Mr. Abrahamson pursues, with indefatigable zeal, the en- 
terprise which he began more than six years ag it of in= 
troducing mutual and elementary instruction throughout the 
States of the King of Denmark. He has the satisfaction to 
see his efforts crowned with a far greater suecess than he had 
dared to promise himself. In his first ee addressed to — 
‘the King, in the month of January, 1824, he 
that at the end of the year 1823, there were inv. Denmark 
ats schools, in which this mode of instruction was in fall 
tion, and 263 others which had begun to be organized on 
this plan ; so that the total number of schools which had 
adopted the method was 607. This number has since in- 
ereased to such an extent, that at the end of the year 1824, 
