A zinc lined tray, six by six feet in area and eight inches deep, is filled with a soil well packed. In one corner of this tray a section of five inches of unglazed drainage tile, having its lower end broken and jagged, is set and the dirt well filled in round it. By means of a Mariotte bottle water is constantly maintained in the bottom of this tile, three-quarters of an inch deep, so that it will flow laterally by capillary action into the adjacent soil, the object being to determine the extent and rate of capillary flow laterally. The water content of the soil is determined at the time of starting the experiment, on the circumferences of circles described with the tile as a center, the distance between the circles being one foot. At stated periods, usually at intervals of one day, the content of moisture is again determined at the same points. The investigations show that the lateral movement of water in the soil is not rapid enough to extend much beyond three feet in thirty-one days, for beyond that distance the soil was found to be drier than at the beginning of the experiment. A record is to be kept of the amount of water delivered to the soil by weighing the supply bottle at intervals, and the rates given at which the soil takes up the water in grams per hour and pounds per day. Also the amount of flow per square foot of soil section together with the mean daily evaporation should be noted. The mean flow per foot of soil section is computed on the assumption that the outer face of the zone of completely saturated soil is the delivering surface. In King’s work this point, as nearly as could be determined, was twelve inches from the corner of the tray and hence the figures at best can only be regarded as approximations. The method of stating results is shown in the following table: SHOWING THE RATE OF LATERAL CAPILLARY FLOW OF WATER IN CLAY LOAM. Date. No. Total mean, Total mean, Mean daily flow Mean daily of hourly flow, daily flow, per square evaporation, days. grams. pounds. foot, pounds. pounds. Jan. 28 to 5 70.70 3.73 2.38 Feb. 2 Feb. 2–7 5 85.98 4.54 2.91 Feb. 7–12 5 79.33 4.19 2.64 Feb. 12–17 5 79.41 4.19 2.64 0.598 Feb. 17–22 5 70.79 3.74 2.38 0.534 Feb. 22–28 6 59.89 3.16 2.01 0.451 Feb. 28 to 6 60.74 3.21 2.04 0.458 March 6 Mar. 6–13 7 60.37 3.14 2.00 0.448 ─────────────────────────────────────────────────────────────────────── Means 2.38 0.498