weight of barium sulphate obtained, the quantity of carbon in the phosphorus is readily calculated. In some instances the experiment was varied by using a large quantity of phosphorus and allowing the action to continue for two or three hours, then weighing the phosphorus which remained unacted upon. In two instances the carbon dioxide was weighed directly by replacing the wash bottle containing the baryta water by weighed potash bulbs. The following are the results obtained I. 6.2272 grams Phosphorus gave .0300 gr BaSO_{4} = .0057 grm CO_{2} = .0016 gr C = _.026%C._ II. 7.9545 grm Phosphorus gave .0324 gr CO_{2} = .0088 gr Carbon = _.111% Carbon_ III. 8.8041 grm Phosphorus gave .0134 gr CO_{2} = .00365 gr Carbon = _.042% Carbon_ IV. 9.0650 grm Phosphorus gave .0540 BaSO_{4} = .0101 grm CO_{2} = .00278 gr C = _.031% C._ V. 16.4633 grm Phosphorus gave .1303 gr BaSO_{4} = .0246 gr CO_{2} = .0067 C = _.041% C._ VI. 11 grams Phosphorus gave .0929 grams BaSO_{4} = .0175 gr CO_{2} = .00478 C = _.043% C._ Footnotes: [1] Annales de Chim. et de Phys. _14_-252 [2] Poggendorf. Ann. _95_-484 Journ. f. prakt. Chemie. _65_-499 [3] Pogg. Ann. _103_-644 [4] Pogg. Ann. _120_-250 [5] Journ. f. prakt Chem. _52_-135 [6] Journ f. prakt. Chem. _53_-65 [7] Journ f. prakt. Chem. _77_-129 [8] Journ f. prakt. Chemie _86_-65 [9] Untersuchungen über Sauerstoff. Hanover 1863 [10] Liebig’s Annalen _154_-215. [11] Annales de Chim. et de Physiologie _3_-58 [12] Compt. Rendus _50_-829 [13] Berichte der Deutschen Chem. Gesellschft. _6_-108 [14] Zeitschrift f. Chemie (1870) _6_-611 [15] Zeitschrift f. Physiol. Chemie _2_-22 [16] Zeitschrft. Physiol Chem. _5_--244 [17] Berichte der Deutsch. Chem. Gesell. _3_-84 [18] Berichte der Deutsch. Chem. Gesell. _8_-1415 [19] American Chemical Journal _4_-50 [20] Berichte d. Deutsch. Chem. Gesell. _15_-2421 [21] Berichte der Deutsch. Chem. Gesell. _15_-222 American Chem. Journ. _4_-53 [22] Berichte der Deutsch. Chem. Gesell. _16_-123 [23] Berichte der Deutsch. Chem. Gesell. _16_-126 [24] Journal Am. Chem. Soc. _1_-232 [25] American Chem. Journal _4_-454 [26] Zeitsch. f. phys. Chem. _5_-250 [27] Berichte der Deutsch. Chem. Gesell. _16_-2146 [28] Chemical News _48_-25 [29] Poggendorff’s Annalen _115_-348. [30] American Chemical Journal _5_-426. [31] Bulletin Soc. Chim. _38_-148 [32] Berichte d. Deutsch. Chem. Gesell. _7_-283 End of the Project Gutenberg EBook of On the Existence of Active Oxygen, by Edward H. Keiser