|: 
jae 
foreign Literature and Science. 393 
a right to a proof of each of the plates purchased by the so- 
ciety in the course of the year. The objects of art, acquir- 
ed by the apa will be exposed to view, before the 
32. Wire Drawing. —The common method of. drawing 
cylindrical wire, consists in forcing the metal through circu- 
lar openings in plates of iron, steel, or some other metal; 
but it is soon observable, that the whole gets worn or de- 
formed, and that the wire then ceases to have the desired 
regularity. Mr. Brookedon of London has nearly remedied 
this inconvenience by passing the metallic thread through 
conical holes made in diamonds, sapphires, rubies, or other 
hard gems. lt appears to be unimportant whether the wire 
be introduced at the large or the small opening of the con- 
ical hole, but the best results, upon the whole, are obtained 
-when the wire is entered by the smaller base, and drawn 
thracgh the larger one. 
33. Hops.—The valuable discovery of Dr. Ives of New- 
York, on the powder of the Hop, as announced in his me- 
_moir, published in volume II. p. 302 of this Journal, has 
excited considerable attention in Europe. M. M. Payen 
and Chevalier, two French chemists, have made some re- 
searches apes the yellow powder (the Lupulin of Dr. i 
which they consider as composing one tenth of the 
They recognize in it the following principles. 
Essential Oil, about - - - .02 
Sub. Acetate of pe hea - - - 
Gum - - 
Malate of os - - - 
A bitter principle ~ - - ~ «5195 
A well cbereranyes, resin - - -525 
Silex 0 
Traces af a fatty sutton, and some salts. 
We limit ourselves (say the editors of the Annales de 
Chimie,) to a statement of these results, without any other 
Vou. VI,—No.- 2. 50 
