438 Miscellaneous Intelligence. 
trials to form it, the following process was found to be the best. 
Six parts of sulphate of copper were dissolved in a small quan- 
tity of water; also, six parts of white arsenic, with eight parts 
of potash of commerce were boiled in water until no further 
quantity of carbonic acid was disengaged. This hot solution 
was gradually mixed with the first, continually agitating until 
effervescence ceased ; an abundant dull yellowish green preci- 
pitate was formed. About three parts of acetic acid were then ad- 
ded, or such a quantity, that a slight excess was sensible to the 
smell; gradually the precipitate diminished in volume, and in 
some hours, a slightly-crystalline powder was deposited at the 
bottom of an entirely colourless solution. The fluid was poured 
off as soon as possible; and the powder, washed with plenty of 
boiling water to remove the last portions of arsenic, was then 
of a brilliant colour. 
Care must be taken not to add to the cupreous solution an 
excess of arseniate of potash, as it causes waste of the acetic 
acid afterwards added, as the latter must be in excess. In re+ 
peating the process in the large way, an arsenite of potash, pre- 
pared with eight parts of oxide of arsenic, instead of six, was 
used, and the result was very successful. M. Braconnot thinks 
that probably a slight variation of the proportion he has given 
may be found advantageous ; but in the mean time considers it 
right to give the best process he is able for the preparation of a 
colour so beautiful, and which may be very valuable in the 
arts.—Ann. de Chim. xx. 53. 
8. Sugar Cane Juice.—M. Vauquelin received some bottles 
from Martinique, containing the juice of the sugar-cane, it 
having been subjected to M. Appert’s process for its preser- 
vation. In most of the bottles, however, a species of semi-trans- 
parent gum had been formed, which, when separated by alcohol 
purified and dried, became white, opaque, and ofa slight sweet 
taste. This substance was very soluble in water, but formed a 
milky solution: it puffed up when heated, carbonized and emitted 
a smelllike that of sugaror gum. It appeared nevertheless to 
contain a small portion of animal matter. By treatment with 
sulphuric acid it did not yield sugar; by nitric acid, it was con- 
verted into oxalic acid, and a yellow bitter matter, but no mucic 
acid was formed. When burnt, it left about ;4,; of ash, consist- 
ing of phosphate of lime, iron and silica. M. Vauquelin con- 
cludes that this substance was formed from the sugar, and did 
not previously exist in it—Ann. de Chim. xx. 93. 
9. Sulep and Magnesia.—Mr. Brander, of Hoxton, found that 
when twenty grains of salep were dissolved in four ounces of wa- 
ter, and thirty grains of magnesia added, the whole became 
afier some hours solid and jelly-like, and even after a month, 
