TREES FOR DRY-FARMING 253 
Of this last tree Aaronsohn says that twenty trees to 
the acre, under a rainfall of twelve inches, will pro- 
duce 8000 pounds of fruit containing 40 per cent of 
sugar and 7 to8 per cent of protein. This sur- 
passes the best harvest of alfalfa. Kearnley, who 
has made a special study of dry-land olive culture in 
northern Africa, states that in his belief a large va- 
riety of fruit trees may be found which will do well 
under arid and semiarid conditions, and may even 
yield more profit than the grains. 
It is also said that many shade and ornamental 
and other useful plants can be grown on dry-farms; 
as, for instance, locust, elm, black walnut, silver poplar, 
catalpa, live oak, black oak, yellow pine, red spruce, 
Douglas fir, and cedar. . 
The secret of success in tree growing on dry-farms 
seems to lie, first, in planting a few trees per acre, — 
the distance apart should be twice the ordinary dis- 
tance, — and, secondly, in applying vigorously and 
unceasingly the established principles of soil cultiva- 
tion. In a soil stored deeply with moisture and 
properly cultivated, most plants will grow. If the 
soil has not been carefully fallowed before planting, it 
may be necessary to water the young trees slightly 
during the first two seasons. 
Small fruits have been tried on many farms with 
great success. Plums, currants, and gooseberries 
have all been successful. Grapes grow and yield well 
in many dry-farm districts, especially along the warm 
foothills of the Great Basin. 
