Acid C. V. Sheppard, Jr.{ ½ “ 40 3.55 18.25 phosphate, also H. C. White, { ½ “ 65 4.05 S. C. 10.35 per cent water-soluble, Acid C. V. Sheppard, Jr.{ ½ “ 40 10.85 16.20 Navassa, also H. C. White,{ ½ “ 65 11.00 2.85 per cent { water-soluble, Bone, H. A. Huston, { ½ “ 30 2.76 20.28 { ½ “ 40 4.01 { ½ “ 50 3.39 { ½ “ 60 5.88 Acid Sheppard and { ½ “ 40 3.46 15.95 phosphate, Robertson, { ½ “ 60 3.82 11.41 per cent water-soluble, Calcined H. A. Huston, { ½ “ 40 2.18 45.46 Redonda, { ½ “ 50 5.52 { ½ “ 65 21.24 { ½ “ 75 32.90 { ½ “ 85 39.52 Calcined H. A. Huston and { 5 hours 40 26.78 42.90 Redonda, W. J. Jones, Jr., { 5 “ 65 38.19 { 5 “ 85 41.57 Pamunky H. A. Huston and { 5 “ 40 3.10 13.84 phosphate, W. J. Jones, Jr., { 5 “ 65 11.80 { 5 “ 85 12.82 Raw bone, H. A. Huston and { 2 “ 40 5.96 23.58 W. J. Jones, Jr., { 2 “ 65 8.22 { 2 “ 85 8.71 Steamed H. A. Huston and { 5 “ 40 16.02 27.67 bone, W. J. Jones, Jr., { 5 “ 65 20.22 { 5 “ 85 20.66 Precipitated H. A. Huston and { 2 “ 40 24.14 33.34 calcium W. J. Jones, Jr., { 2 “ 65 23.45 phosphate { 2 “ 85 22.46 from glue works, Florida H. A. Huston and { 2 “ 40 0.00 19.75 soft rock, W. J. Jones, Jr., { 2 “ 65 1.69 { 2 “ 85 1.99 INFLUENCE OF QUANTITY OF MATERIAL USED. (A) = Temperature, degrees C. (B) = Quantity of material used. (c) = Citrate-soluble phosphoric acid. (D) = Total phosphoric acid. Material. Authority. Time (A) (B) (C) (D) Grams. Per cent. Per cent. Orchilla F. B. Dancy, { ⅔ hour 40 2.0 9.94 21.68 guano, { ⅔ “ 40 1.0 12.14 { ⅔ “ 40 0.5 13.51 { ½ “ 65 2.0 6.62 { ½ “ 65 1.0 9.33