Original Schloesing’s sand. soil. Dried at 150°C., Ignited, Ignited, per cent. per cent. per cent. Above 0.25 millimeter diameter 0.12 0.10 0.92 0.25–0.05 millimeter diameter 3.58 3.55 2.89 0.05–0.01 millimeter diameter 42.69 41.87 42.86 0.01–0 millimeter diameter 23.66 20.47 } 31.44 Clay 12.81 10.14 } Clay 7.40 Loss on ignition 6.73 14.49 ————— ————— —————— 82.86 82.86 100.00 Osborne says the above figures indicate that the treatment with acid has disintegrated the particles of less than 0.01 millimeter diameter so that one-third of this portion appears as clay, according to the Hilgard method of estimating clay, which is the one employed. As to the humus it may be noted that loss in the analysis by Schloesing’s method; _viz._, 2.41 per cent, plus loss at 150° = 4.42 per cent, plus humus found = 1.57 per cent, plus carbon dioxid (⁴⁴⁄₅₆ of 0.88 =) 0.69 per cent amounts to 9.09 per cent, while the loss on ignition which represents humus, carbon dioxid and water is 14.49 Per cent. The 5.40 per cent difference must evidently be, for the most part, humus which has escaped estimation by the Schloesing method, having been distributed among the sand and clay. =237. The Mechanical Determination of Clay.=—Schloesing’s method for the separation of the clay as stated by Osborne[156] is essentially one of subsidence for twenty hours from a volume of from 200 to 250 cubic centimeters of water, but of no specified height. Hilgard’s conventional method requires the same time and a height of solution of 200 millimeters.