BUD VARIATION IN THE LISBON LEMON. 5 
The original plat included 113 trees. Later additional trees which 
represented important strains were added to this number in order to 
secure as complete information as possible concerning variability 
within the variety. 
METHODS OF KEEPING PERFORMANCE RECORDS. 
The same general methods of keeping performance records as those 
governing the work with the Eureka lemon were followed in the studies 
of variations in the Lisbon variety. These methods involve consid- 
erably more detailed observation than is usually considered necessary 
in commercial orchard practices. A method which has been adopted 
for commercial lemon-tree record keeping is described in Farmers’ 
Bulletin 794, entitled ‘‘Citrus-Fruit. Improvement: How to Secure 
and Use Tree-Performance Records.”’ 
Each of the trees in the performance-record plat was given an 
individual-tree number which consisted of three parts: (1) The 
number of the block in which the tree occurred; (2) the number of 
the row in the block, counting from some fixed point; and (3) the 
number of the tree in the row. This number was painted in a ver- 
tical position on the tree trunk. The fruits from each tree were — 
picked at monthly intervals. The size of the fruit to be picked was 
determined by means of metal rmgs similar to those used by the 
regular picking crew in the orchard. While the size of the rings 
varied at different seasons of the year, no change was ever made 
during any one picking, so that the crops from the individual trees 
each month were comparable with each other. The fruit from each 
tree was kept separate, and the lemons after picking were assorted 
into three grades, namely, Green, Tree-Ripe, and Culls. The Green 
erade was made up of the alltel commercial fruits and included 
both dark and hght green lemons; the Tree-Ripe grade was made up 
of mature or prematurely Piped fruits, which usually were of 
small size and thin rinds; and the fruits of the Cuil grade were fre- 
quently extremely coarse or malformed. In addition, all lemons 
which dropped to the ground between picking periods were included 
in the Cull grade. The number and weights of the lemons in each 
erade were secured, and all variable fruits were sorted out and classi- 
fied. One lemon of each grade was taken from the crop of each tree 
at each picking and the number of seeds counted. In the event that 
any samples of fruits of any grade were missing, so that the seeds could 
not be counted, a note of this fact was made in the field form by using 
the words ‘‘No count.”’ 
All the data obtained in the field were recorded in special field note 
forms. As soon as practicable after each picking these data were 
transferred to forms which provided for a maximum of twelve pickings, 
or the monthly pickings for one year. When the complete record for 
