Bui. 821, U. S. Dept. of Agriculture. 
PLATE n, 
A Lisbon Lemon Tree in Plat 10. Typical of Nonheated Orchards. 
Most of the fruits which were not protected by heaters during the low temperatures of 1912-13 were 
so badly frozen as to render them unmarketable, and the trees were almost defoliated by the low 
temperatures. Many of the unprotected trees were seriously injured by the splitting of the bark, 
so that it was found necessary to practice severe pruning in order to cut ofi the injured limbs and 
renew the tops. Photographed in January, 1913. 
