Scientific Intelligence. «1 
traces of morbific symptoms remained. ‘The experiment has been 
tried on various other animals, with similar results —Jdem. 
14. Copal Varnish, by J. J. Berzelius—Copal reduced to 
coarse powder, and watered with caustic liquid Ammonia, swells, 
and is converted into a gelatinous mass, which is entirely soluble in 
alcohol. To effect this solution, which makes a very beautiful var- 
nish, liquid ammonia is to be added by degrees, to pulverized copal 
till the swelling ceases, and it becomes a clear and consistent mass. 
ft is then heated to 35° cent., and introduced in small portions at a 
time, to alcohol of 8, having a temperature of about 5° cent., shaking 
it well after each addition. A solution is thus obtained, which, after 
depositing an insignificant portion of sediment, is absolutely color- 
less, and as clear as water.—Jour. de Con. Usuelles, Oct. 1828. 
15. On the Oily and Resinous products of the distillation of 
Wood, by M. Berzelius. (An. de Pog. 1828, p. 76.)—It is well 
known that the distillation of wood furnishes ‘sin distinct products = 
ist. An empyreumatic oil; 2d. An aqueous liquid; 3d. Various 
gases ; and 4th. Charcoal. 
By repeatedly distilling the empyreumatic oil with water, a por- 
tion of limpid oil is separated from it, which I call pyrelaide, and a 
resin, which I shall designate by the name of pyrétine. 
The pyrelaide varies with the vegetable substance from which it is 
obtained; it is colorless, or slightly yellow, of a very strong and 
disagreeable odor, and a sharp and nauseous taste 5 it burns with a 
clear flame and smoke ; it ‘dissolves more or Jess easily in alcohol, 
and very readily in ether, as well as in the fixed and volatile oils; it 
forms with concentrated sulphuric acid, a compound ariilopons: to 
sulphovinie acid ; it dissolves resins and caoutchoue 5 nitrie acid con- 
Verts it into resin; it sometimes preserves its fleidity in the air, and 
Sometimes is trsnsftirined into a dark resin. egal LIA 
The pyrétine is of a very variable compos varieties. 
contain free acetic acid, ate others none. A substance analagous 
to ulmine, may be extracted from it. me 
The aqueous liquid contains, 1, water, 2. acetic sr gm 
tate of ammonia, 3, empyreumatic oil, and some pyrétine acid, 4, 
a azotized substance, similar to extract, 9, a liquid volatile sub- 
stance, analogous to alcohol, and known under the name of pyrolig- 
neous acid. When the aqueous liemid 3 ic gnhiected to a redistillation 
