Foreign Literature and Science. 197 
fresh plants in a vessel containing the solution, and also by . 
inserting the poison under the bark, or in the pith of the 
lant. e effects were always decisive, in some instances 
manifesting themselves in a few moments, (particularly in the 
case of vegetable poisons,) by the binding of the petiole cris- 
pation of the leaves, sickliness and final death of the plant. 
Idem. 
19. Russian Mines.—One of the periodical journals of 
St. Petersburg furnishes an interesting statement of the pro- 
duce of the gold and silver mines of Russia. From 1818 to 
1823, the-mi i yielded 4145 
pounds (livres) of pure gold, and 340 pounds of'pure silver ; 
and the mines appertaining to private owners, 10385 pounds 
of pure gold, and 821 pounds of pure silver. During the 
second half of the year 1824, the crown mines afforded 970° 
pounds of gold, and 86 of silver, and the private mines 3067 
pounds of gold, and 245 pounds of silver. 
Rev. Ency. Av. 1825. 
20. Technological Institutes have been founded at Mos- 
cow and Stockholm for the cheap instruction of young | 
see Bg 
in those sciences which have a practical application to 
the useful arts.—IJdem. 
21. Deaf and Dumb.—Mr. ABRAHAMSON of Copenhagen, 
of whem we have often had occasion to speak in this Journal, 
does not limit the circle of his activity to the schools of mutu- 
al instruction alone. He is one of the most active members, 
placed by government at the head of the Deaf and Dumb In- 
stitution. Formerly, this instituti | was able to receive only. 
50 pupils; but for some time past, it has contained 70, and 
preparations are making to extend the number to 90, which, 
agreeably to the last census, is the number of deaf and dumb 
in the states of Denmark, whose-parents are not able ‘to af- 
ford them the necessary instruction under the paternal roof. 
An establishment of the same kind at Sleswig, provides for 
all the deaf and dumb of the German provinces of npr y 
em. 
22... An Iron Bridge, constructed near Potsdam, (Prus- 
Sia) was opened to the public on the Ist of Augnst last. It 
#s composed of nine arches of iron, cast in Silesia. Its length 
