General l^cience. 4id 
witJimit requiring another copper-plate^ or occupying more than 
two or three hours. For example, from the large atlas engra- 
vings of the Description de TEgypte, he could make an edition 
in octavo without changing the plates. The certainty of the 
process has been corroborated by the members of the jury ad- 
mitted into his works; and the jury, in consequence, decreed a 
gold medal to M. Gonord. Ami. de Chim. xiii. p. 95. This 
discovery, if there is no mistake about it, must be considered as 
one of the most surprising that has ever been made in the arts. 
We can see no reason why stereotype plates, or pages of types, 
should not be employed to yield duodecimo and folio editions 
of the same work, and why the same die should not be employ- 
ed in coining farthings as well as crowns. 
45. Extraordinary diversity of colom'S used in Mosaic work. 
—In an extract from Mr CadePs Travels, in a former number 
of this Journal, an account is given of the manufacture of Mo- 
saic, in which it is stated that 17,000 tints of colour are employ- 
ed in imitating the finer paintings. In a very amusing work of 
the celebrated Gothe, entitled “ Winkelmann und sein Jahr- 
hundert it is stated that about 15,000 varieties of colour are 
employed by the workers in mosaic in Rome, and that there are 
50 shades of each of these varieties, from the deepest to the pa- 
lest, thus affording 750,000 tints, which the artist can distin- 
guish with the greatest facility. We should imagine, with the 
command of 750,000 tints of colour, that the most varied and 
beautiful painting might be perfectly imitated ; yet this is not 
the case, for the mosaic workers find a want of tints even 
amidst this astonishing variety. 
46. Population of Van DiemerCs Zawd.-wThe total population 
of Van Diemen’s land in 1819 was about 4860 persons ; the 
free persons being 2074, and the convicts 2289. The whole 
number of acres in cultivation was 8330. The number of 
horses was 366; horned cattle 23,124; and sheep 17^,128, 
There were 10 schools on the island, and 220 scholars. Asiatic 
fournali N° 57. p. 22Q. 
