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PDF[Footnote 9: Comptes Rendus, 90, 1410.]
As, in nearly all of the methods which were employed for estimating carbonic acid in the air, provision is not made for the exclusion of air not measured containing carbonic acid from the alkaline fluid before titrating or weighing, the results are generally too high and show a far greater variation than is found by more exact methods. For example, Gilm[10] found from 36 to 48 volumes; Levy’s[11] average is 34 volumes; De Luna’s[12] 50 volumes; and Fodor’s,[13] 38.9 volumes. Admitting that the quantity of carbonic acid in the air is subject to variation, yet the results of Reiset’s and Schultze’s estimations go to prove that the variation is within narrow limits.
[Footnote 10: Sitzungsher. d. Wien. Akad. d. Wissenschaften, 34, 257.] [Footnote 11: Ann. d. l’Observ. d. Mountsouris, 1878 and 1879.] [Footnote 12: Estudios quimicos sobre el aire atmosferico, Madrid, 1860.] [Footnote 13: Hygien. Untersuch., 1, 10.]
Indiana University
Chemical Laboratory,
Bloomington, Indiana.
—Amer.
Chem. Journal.
* * * * *
ANALYSIS OF KOLA NUT.
Alkaloids or crystallizable principles:
Per
Cent.
Caffeine.
2.710
Theobromine.
0.084
Bitter principle.
0.018
Total
alkaloids. ----- 2.812
Fatty matters:
Saponifiable fat or oil.
0.734
Essential oil.
0.081
Total
oils. ----- 0.815
Resinoid matter (sol. in abs. alcohol)
1.012
Sugar:
Glucose (reduces alkaline
cuprammonium). 3.312
Sucrose? (red. alk. cupram.
after inversion)[1]. 0.602
Total
sugars. ----- 3.914
Starch, gum, etc.: Gum (soluble in H2O at 90 deg. F.). 4.876 Starch. 28.990 Amidinous matter (coloring with iodine). 2.130 Total gum and fecula. ----- 35.999 Albuminoid matters. 8.642 Red and other coloring matters. 3.670 Kolatannic acids. 1.204
Mineral matter:
Potassa.
1.415
Chlorine.
0.702
Phosphoric acid.
0.371
Other salts, etc.
2.330
Total ash.
----- 4.818
Moisture.
9.722
Ligneous matter and loss.
27.395
-------
100.000
