BUD VARIATION IN THE MARSH GRAPEFRUIT. 19 
found in these trees bearing fruits all of which were heavily seeded. 
Frequently individual fruits, either seedless or heavily seeded, are 
found in trees of the Marsh strain. However, seedless fruits occur 
much more frequently than heavily seeded ones. 
In trees of the Rough Seedy strain, smooth, flattened, seedless 
fruits characteristic of the Marsh strain have been found. The 
occurrence of the typical Marsh fruits in the trees of the Rough 
Seedy strain is as much of a variation as the occurrence of ribbed 
fruits in trees of the Marsh strain. 
In a few cases limbs have been found in trees of the Marsh strain 
bearing several bell-shaped, corrugated fruits with thick rinds, as 
illustrated in Plate X. These fruits are produced from flowers 
which bloom during the normal period and are not the result of flowers 
developed out of the regular blooming period. 
Many other variations in fruits of the Marsh variety of grapefruit 
have been observed, but are apparently of less importance than the 
ones cited in the foregoing paragraphs. The studies of these fruits 
and their relation to bud variation and bud selection are being con- 
tinued with the object of securing definite and reliable information 
concerning their characteristics. 
SEASONAL FLUCTUATIONS IN PRODUCTION. 
The influence of extreme climatic conditions upon the behavior 
of grapefruit trees, while less marked than in the case of orange and 
lemon varieties, is, nevertheless, of importance in considering the 
performance records of the individual trees in these investigations. 
For instance, the severe freeze during the winter of 1913 upset the 
behavior of these trees to some extent for the two following seasons. 
One effect of the freeze was to kill much of the tender fruit-bearing 
wood. Naturally the loss was greater in the productive than in the 
unproductive trees. The loss of this wood and the time required for 
the tree to repair the injury resulted in a reduction of the yield for the 
following seasons. 
Continued dry winds, with a very low condition of relative humidity, 
sometimes increase the transpiration from the trees beyond the wilt- 
ing point. The evaporation of soil moisture is also increased to an 
abnormal degree at such times, thus reducing the moisture available 
for use by the trees. Such conditions check the development of 
fruit-bearing wood and influence the amount, texture, and appear- 
ance of the rind and size of the fruits. If these dry winds occur 
during the blooming period, or shortly following that time, an 
unusual drop of flowers or young fruits occurs, so much so in some 
cases as to materially reduce the yield of the trees. 
In the selection of parent trees for propagation on the basis of 
their performance records, it is necessary to take into account any 
