When pots containing fertile soils are seeded to wheat or barley for continuous seasons, and successive short period crops of four to six weeks' growth are removed from such soils, it is found that the first crop is usually the largest, the immediately succeeding crops are much smaller, but some of the latter crops may be larger than some of the preceding ones. Thus instead of soils becoming progressively poorer by continuous cropping due to progressive diminution of its supply of plant food, they may become better at certain times than they were before, through certain processes and agencies concerned in the growth of plants. The results obtained with soils (7) led the writer to conduct experiments with culture solutions, and to employ a method that would provide a number of successively grown crops under the same climatic complex. As the method required that the same nutrient solution be used repeatedly, large glass bottles of 6 liter capacity were used as the culture containers. These were filled with a nutrient solution of two atmospheres osmotic value, which was composed of equal partial molar concentrations of KH2PO4, Ca(NO3)2, and MgSO4. The experiment was begun by planting a set of these containers with wheat seedlings. The plants were allowed to grow six weeks. They were then removed, and newly germinated seedlings, 4-6 cm. high, were placed in this set of containers. At the same time another set of containers having the original nutrient solution were likewise planted with wheat seedlings. The first set of containers, therefore, grew its second crop at the same time that the second set grew its first crop. Thus any number of crops grown successively and under the same climatic environment can be obtained by introducing a new set of culture containers into a series when the other sets thereof are replanted for progressive numbers of crops. No addition of salts or renewal of nutrient solution was made during the course of the investigation, except to add distilled water