+-------------------+-------------------------------------------+------------+ | | Quantity | Power of | | | of | retaining | | | hygrometric water absorbed | heat. | | | by 77.165 grains of the soil spread on | Calcareous | | | a surface of 141.48 square inches. | sand, | --------------------+----------+----------+----------+----------+ 100. | | | 12 hours.| 24 hours.| 48 hours.| 72 hours.| | --------------------+----------+----------+----------+----------+------------- | Siliceous sand | 0 | 0 | 0 | 0 | 95.6 | | Calcareous sand | 0.154 | 0.231 | 0.231 | 0.231 | 100.0 | | Light clay | 1.617 | 2.002 | 2.156 | 2.156 | 76.9 | | Stiff clay | 1.925 | 2.310 | 2.618 | 2.695 | 71.1 | | Heavy clay | 2.310 | 2.772 | 3.080 | 3.157 | 68.4 | | Pure clay | 2.849 | 3.234 | 3.696 | 3.773 | 66.7 | | Carbonate of lime | 2.002 | 2.387 | 2.695 | 2.695 | 61.8 | | Humus | 6.160 | 7.469 | 8.470 | 9.240 | 49.0 | | Gypsum | 0.077 | 0.077 | 0.077 | 0.077 | 73.2 | | Garden soil | 2.695 | 3.465 | 3.850 | 4.004 | 64.8 | | Soil from Hoffwyl | 1.232 | 1.771 | 1.771 | 1.771 | 70.1 | | Soil from Jura | 1.078 | 1.463 | 1.540 | 1.540 | 74.3 | --------------------+----------+----------+----------+----------+------------+