26 
BULLETIIT 821, U. S. DEPARTMENT OF AGRICULTURE. 
In figure 13 a graphic presentation of the yields of Lisbon lemon 
trees in the heated plat 6 and the nonheated plat 8 for the two years 
1913 and 1914 is given. In 1913 the behavior of the nonheated plat 
was very similar to other nonheated plats in that the bulk of the fruits 
was frozen and was removed at the first picking. The plat did not 
return to normal production until December of that year. In January, 
1914, the estimated number of merchantable fruits picked from the 
nonheated plat was 46,800, as compared with 30,990 on the heated one. 
In referring to Tables XX and XXI it will be seen that 1 1 pickings 
were made in plat 6 during the calendar year 1914, as compared with 
8 pickings in plat 8. This was due to the fact that the two orchards 
belonged to different companies, and a different system 
of picking was followed in each orchard. In order to make 
the data in figure 13 comparable, it was necessary to add 
the figures obtained in February and March in plat 6 and 
present them in 
~ comparison with 
- the picking in 
_ plat 8 in March. 
The August and 
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Fig. 13.— Diagram showing the number of frozen and merchantable fruits produced on plat 6, a heated 
acre of Lisbon lemon trees, and plat 8, a nonheated acre of Lisbon lemon trees, for the calendar years 
1913 and 1914. The figures here showTi are taken from Tables X, XII, XX, and XXI, respectively, 
which give the estimated production by grades for each month's picking for these plats during these 
years. 
September pickings in plat 6 were totaled to make them comparable 
with the one picking made for the same period in plat 8. A similar 
addition was made of the September and October pickings in plat 6 
to make them comparable with the fruit obtained in plat 8 for the 
same period. In March the fruits obtained from the heated plat 
were considerably more than those obtained from the nonheated plat. 
In May, however, the nonheated plat led, and after that month the 
two plats alternated throughout the year. 
From the data secured in these two plats it would appear that the 
nonheated trees had returned to normal production by the beginning 
of 1914 and that the heating during the cold period in January, 1913, 
had practically no effect on the second season's crop. It must be 
