Carbon, 75.944 According to Dr. Ure 75.0 
Oxygen, 13.337 ————raaceevsersenrereeeeeres - 126 
Hydrogen, 10.719 ees | TER 
100 parts. 100 parts. 
601. There are many varieties of resin. Common resin 
_ isobtained from the different species of Fir, the Pinus syl- 
_vestris, P. Abies, P. Larix, P. balsamea, &c. The first of 
_ these yields common turpentine, consisting of resin (in this 
case called rosin), and oil of turpentine ; the P. Larix gives 
_ Venice turpentine ; the P. Balsamea, Canada Balsam; the 
P. Abies, musk or frankincence. Strasburgh turpentine 
is obtained from the Pinus Picea: mastick is obtained from 
the Pistachia lentiscus ; sandarach from the Juniperus com- 
munis ; copal (much used for varnishing) from the Rhus 
_ copallinum ; elemi from the Amyris elemifera, §¢. 
602. Balsams consist of resin, volatile oil, and benzoic 
_ duce of the Protium Gileadense ; copaiva, obtained from the 
_ Copaifera Langsdorfii ; balsam of Tolu, from the Toluifera 
- benzoin, from the Styraz benzoina ; storax, from the Styrax 
officinale ; dragon’s-blood, from the Calamus Draco, Ptero- 
_ carpus Draco, and Dracena Draco. 
tween gum and resin, of which they seem to be compounds. 
The most leading are, ammoniac, from the Dorema Am- 
moniacum ; aloes, from the various species of Aloe ; assa- 
 Galbanum officinale ; olibanum, from the Juniperus lycia, 
or from the Boswellia serrata; opoponax, from ie 
RESINS. 159 
_ acid. The principal are, opobalsam or balm of Gilead, the pro- 
_ balsamum ; balsam of Peru, from the Myroxolon Peruiferum ; — 
603. Gum-resins are intermediate in their properties be- 
~ 
| feetida, from the Ferula assafetida; galbanum, from the 
