Pamunky H. A. Huston and { 65 ½ hour 4.43 13.84 phosphate,[113] W. J. Jones, Jr.,{ 65 1 “ 8.28 { 65 2 hours 10.34 { 65 5 “ 11.80 { 65 10 “ 12.58 Calcined H. A. Huston and { 65 ½ hour 21.24 45.15 Redonda, W. J. Jones, Jr.,{ 1 “ 31.70 { 2 hours 36.92 { 5 “ 41.00 { 10 “ 42.70 South H. A. Huston and { 65 ½ hour 2.82 25.51 Carolina W. J. Jones, Jr.,{ 1 “ 3.13 rock, { 2 hours 3.57 { 5 “ 3.88 INFLUENCE OF TEMPERATURE. (A) = Temperature, degrees C. (B) = Citrate-soluble phosphoric acid. (C) = Total phosphoric acid. Material. Authority. Time of (A) (B) (C) Digestion Per cent. Per cent. Apatite T. S. Gladding[114]{ ½ hour 40 0.30 Canadian, { ½ “ 65 0.56 Orchilla T. S. Gladding, { ½ “ 40 4.63 guano, { ½ “ 65 4.81 South T. S. Gladding, { ½ “ 40 1.09 Carolina { ½ “ 65 1.35 river rock, Navassa T. S. Gladding, { ½ “ 40 2.73 rock, { ½ “ 65 2.53 Grand T. S. Gladding, { ½ “ 40 1.16 Connetable, { ½ “ 65 1.96 Redonda, S. W. Johnson and { ½ “ 40 1.70 36.68 E. H. Farrington, { ½ “ 65 1.85 South S. W. Johnson and { ½ “ 40 1.32 25.48 Carolina E. H. Farrington, { ½ “ 65 1.65 rock, Orchilla S. W. Johnson and { ½ “ 40 4.92 21.05 guano, E. H. Farrington, { ½ “ 65 5.85 Navassa S. W. Johnson and { ½ “ 40 4.10 29.90 rock, E. H. Farrington, { ½ “ 65 4.22 Acid S. W. Johnson and { ½ “ 40 11.95 16.50 Navassa, E. H. Farrington, { ½ “ 65 13.53 Fine-ground S. W. Johnson and { ½ “ 40 9.40 23.50 bone, E. H. Farrington, { ½ “ 65 12.90 South C. V. Sheppard, Jr.{ ½ “ 40 1.72 24.50 Carolina also H. C. White, { ½ “ 65 2.11 land rock, Orchilla C. V. Sheppard, Jr.{ ½ “ 40 6.48 15.85 guano, also H. C. White, { ½ “ 65 6.75 Calcined C. V. Sheppard, Jr.{ ½ “ 40 5.70 44.85 Redonda, also H. C. White, { ½ “ 65 10.20 Raw C. V. Sheppard, Jr.{ ½ “ 40 4.49 43.79 Redonda, also H. C. White, { ½ “ 65 7.92