HED—H£M 165 
hard and condensated, if left in the bottle long undis- 
- turbed. Melts by heat, sp. gr. 1.2289. Water dissolves 
out of it, 9 per cent. of extractive matter—aleohol 95, 
and ether 40 parts ina hundred. The alkaline solutions, 
and their carbonates, readily dissolve it. lphuric acid 
dissolves it, with but little effervescence——the solution 
heing of arich claret colour. Nitric acid dissolves it, with 
a copious extrication of nitrous fumes. Muriatic acid dis- 
solves but little of it; in all these cases, the guaiacis de- 
composed. Mr. Hatchett has proved by experiments, thatit 
is not a gum nor a gum-resin, but a substance sui generis. 
Mepicat Prorrrtizs axp Uses. Stimulating, diaphoretic, — 
diuretic; in large doses, purgative. May be given in @ 
bolus, or diffused in water, by means of 4 its own weight 
of gum Arabic. Dose, grs. x to ss. 
The ammoniated tinct. is Dewees’s emmenagogue. 
Is sometimes adulterated with common resin, which may be 
detected by the turpentine emitted, when the guaiac is 
thrown on hot coals—sometimes with manchinal gum, 
which may be discovered by adding to the tincture a few 
drops of sweet spirit of nitre, and diluting with water— 
the guaiac is thts precipitated, and the sophisticati 
article flows in white striz, 
Orric. Pree. Mistura Guaiac. L. Tinet. Guaiac. L. E. D. 
&U.S. Tinct. Guaiac. Ammoniat. L. E. D. & U.S. Pulv. 
iloes Comp. L. D. 
H. 
No. 293.—Herproma Pueciorpes. American Pen- 
= "No. 
nyroyal. , 
See W. P. C. Barton’s Veg. Mat. Mcd. U.S. Vol. I. 
Cle specimen, Jeff. Coll. No. 338—figure of the plant, 
294.—Hamatoxyion C AMpPEcHIANUM. The 
logwood tree. ie es 
Orricinat. Hematoxyli lignum. L. E. D. & U. 8. Logwood. 
Cabinet specimen, Jeff. Coll. No. 340.—figure of the tree, 
No. 341. spe 
. 
This tree is a native of South Amcrica, attaining to great 
perfection at Campeachy, in the Bay of Hondaras. intro- 
~. VOL. 11.” ge P 
duced into Jamaica, in 1715 ; and, from its rapid growth, 
~ now grows abundantly there, so as to incommode the land- 
holders, in the neighbourhood of Savannah lx Mar. 
Qvazitizs. Appearance well known—taste sweet and as- 
tringent, colour decp-red—yields Hematina. 
Mepicat Paorertiss anv Uses, An astringent—not very 
