BULLETIN OF THE BUSSEY INSTITUTION. 39 
In respect to coffee, Schrader * found that broken unroasted berries, 
that were boiled several times with water, yielded 21.859 of dry extract 
and 66.679 of sharply dried residue, From roasted and powdered berries, 
he got 28.75% of extract, and 68.75% of dry residue. He found 3.91% 
of ashes in the original unroasted berries, and that 33 per cent of this 
ash was carbonate of potash. Levi found 3.19% of ash, and Herapath 
3.30%, containing 40.819 of matters soluble in water. Allen +t found 
49, of ash on the average, and that 81% of the ash was soluble in water. 
J. Lehmann f{ has analyzed an extract obtained by partially exhausting 
roasted coffee with water, as follows: 100 parts of the boiled berriea 
yielded 21.52 parts of dry extract containing 16.6% of ashes (or 3.41% 
of the roasted coffee takin). 100 parts of the extract contained : — 
Extract of Graham and others (Bus- 
coffee. sey Bulletin, 1. 216) found 
in the ash of the coffee 
berry. 
Deane Pelee) oo) 62.70 08.) ss) 51.52 0:55.80 
Pern el «68.58 
Meenesia eS. >, 8.67 
eesoerer iron! wf, .... 0.25 
Puospnorne acid. §2/410,02 . . . . . 10.15 to 11.60 
Sulphuric acid . . 4.01 
Silicic acid... . 0.78 
eeeaneencrt ys.) )..020:50) . is 2. . « 14.74 t018.18 
Sand and charcoal . 0.49 
Clore fe ede «0.94 
That is to say almost the whole of the potash and of the phosphoric 
must have passed into the extract and have left the leached berry. This 
consists with the observation of Berard,§ who found in coffee-grounds: — 
Phosphoric 
Ashes. acai 
When in the air-dried state. . . . 1.50% : 0.24.0, : 0.273%, 
as ee a kh os OOS 6. vey UO, S0ii 0% 0-010 
Nitrogen. . 
The large amounts of potash and of phosphoric acid that are dissolved 
from plants by water, and the small amounts of these substances that 
are left in the spent plants, point to the conclusion not only that the 
thoroughly washed plants can have but little fertilizing power in respect , 
to these ash ingredients, but that the mere leaching of fallen leaves, or 
mown weeds or hay upon a field, may add to the land an appreciable 
amount of manure. 
* Gehlen’s ‘‘ Journal fiir Chemie, Physik, und Mineralogie,” 1808, 6. pp. 553, 
656. 
t “Chemical News,” 1874, 29. pp. 140, 190. 
t Liebig’s ‘‘ Chemische Briefe,” 1859, 2. 182. 
§ Hoffmann’s “ Jahresbericht iiber Agrikultur-Chemie,”’ 1859-60, 2, 213. 
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