K₂SO₄ cubic Weight of Weight of K₂O Salt centimeters K₂PtCl₆ in K₂PtCl₆. absorbed removed filtrate taken. twenty-five by 100 per cubic grams cent. centimeters of soil. solution. (a) 25 0.6113 gram 0.4426 gram (b) 25 0.4371 „ 0.3324 28.0 gram —————— Mean 0.4399 „ (NH₄)₂SO₄ cubic Number cubic Half normal acid N absorbed Salt centimeters centimeters neutralized. by 100 absorbed filtrate taken. one-half normal grams per acid neutralized soil. cent. by fifty cubic centimeters of solution. (a) 50 10.00 7.25 grams (b) 50 7.25 „ 0.0964 27.5 gram ———— Mean 7.25 „ NaNO₃ cubic Number cubic Cubic centimeter N absorbed Salt centimeters centimeters N₂O₂ N₂O₂ at 0° and by 100 absorbed filtrate taken. afforded by ten 1000 grams per cubic millimeters. soil. cent. centimeters of solution at 0° and 1000 millimeters pressure. (a) 10 16.63 16.77 grams (b) 10 16.70 „ none 00.00 ————— Mean 16.73 „ Upon comparing the figures it will be found that the absorption, passing from the greatest to the least, is as follows: phosphoric acid (P₂O₆), potassium sulfate, ammonium sulfate, potassium chlorid and sodium nitrate.