1816.] during the Year 1815. 51 
7. Sap of the Vine.—Dr. Prout has made a chemical analysis of 
this sap. (Annals of Philosophy, vol. v. p. 109.) It was slightly 
whitish like river water, had a sweetish taste, and its specific gravity 
did not sensibly differ from that of pure water. Alkalies reddened 
it, and threw down a flocky precipitate, which was redissolved by 
acetic acid. Oxalate of ammonia threw down a white precipitate, 
460 grains of it being evaporated left only 1th of a grain of resi- 
duum. One half of this was carbonate of lime; the rest was a 
peculiar vegetable matter, not soluble in alcohol. It gave traces 
also of carbonic acid, acetic acid, and of an alkali which was 
probably potash. 
8. The juice of the ribes grossularia, or green gooseberry, yielded 
to Dr. John the following constituents: 
Much water. Traces of phosphates of lime and 
Uncerystallizable sugar. magnesia, 
Supercitrate of potash. Trace of muriate of lime ? 
Supermalate of potash. A little phosphate? of iron. 
A little resin. Ammonia, ‘probably combined 
Prunin or cerasin. with citric and malic acids. 
Tnsoluble modified gum. ‘| Fibrin. 
A salt with base of magnesia. 
9. 300 parts of angelica Archangelica dried yielded the same 
Cc 
chemist the following constituents : 
Colourless and very volatile oil 
ee ncn. Jeclisecanenien dun davioas Newbee: 100°5 
ie ois nibs aia’ eaelisiicdes efeeevaene of ee 13 
Wwierextractive otis oldieiaisieis ls vieldwxthe oo o 200 37'S 
Sharp tasted resini.!. sssieeise oe se celacnes owes 20 
A peculiar substance soluble only in potash...... 22 
OPED WEE. 2 Lids dois eselide. Saves ue 
Peties md Lib 8 wie nte's dsiowgns. (Es pupa. ane 
: 300 
The earthy constituents were 
Phosphate of lime. | Phosphate of magnesia. 
Phosphate of iron. Silica? 
10. The juice of the Leontodon taraxicum, or dandelion, 
yielded the same chemist the following bodies : 
Water. A trace of gum? 
Caoutchouc, An acid. { 
Bitter extractive. Muriate, phosphate, and sul- 
A sweet substance? phate of lime, and of an 
A trace of resin, alkali. 
11. The milky juice of the ficus carica, or fig-tree, yielded him 
Caoutchouc. A trace of extractive soluble in 
Resin, soluble only in boiling | — water. 
alcohol. Salts. 
12. The milky juice yielded by the young bark and wood of the 
D 2 
