Summary1. Two profiles of a drift soil at Craibstone, Aberdeenshire, have been examined in the field and in the laboratory. Both profiles have been derived from parent material of the same geological origin—a somewhat gravelly drift consisting of the granitic and metamorphic rocks of the district. One of the profiles was taken in uncultivated land and the other from arable land in the same area.2. The chief results obtained in the present investigation may be summarised as follows: