880 
Journal of Agricultural Research 
Vol. XXXI, No. *> 
Regions Compared 
Buds taken August 1 from the tree in the coastal-valley section 
had smooth crowns, while no signs of this condition were evident 
in either of the other locations. However, in the subsequent collec¬ 
tions the coastal-valley apricots seemed to be slightly behind, espe¬ 
cially in pistil development, until the collections of October 15 (fig. 3). 
Buds collected from the coastal-valley district at this latter date 
showed a stage of development which buds from the other two loca¬ 
tions required an additional month to reach. These more advanced 
buds contained well-defined pollen mother cells on October 15. 
The apricots grown in the foothills and in the interior valley showed 
differentiation of fruit buds on August 10, which developed at about 
the same rate until in September, when the buds grown at the higher 
fO 
jy 
Interior VfolWtj . Lightly FVunrd f1#tt-lrVipat«d 
Coatt . Lightly PVuned . flarlrripaW 
Siorra Foothill*. Lightly PVuned . Irrijotld 
Seasonal Pevelopment of 
Royal Rpncot Fruit Buds 
in I922‘25 as Influenced 
by Conditions Indicated 
Fig. 3.—Outline drawings of longitudinal sections through Royal-apricot fruit buds, showing the aver¬ 
age stages of development at the various dates and under the various conditions 
altitude assumed a slight lead over the buds grown in the valley. At 
this time the buds under foothill conditions had anthers in the 
mother-cell stage of development. 
DISCUSSION 
With the long growing season in California it would seem logical 
to suppose that fruit-bud differentiation would take place earlier 
than in the East. This assumption appears well founded, since the 
Kieffer in Virginia ( 3 ) and the Wilder Early in Wisconsin ( 6 ) were 
found to show signs of fruit-bud differentiation about three weeks 
later than the Bartlett in California. Disregarding varietal differ¬ 
ences, the late differentiation of pear fruit buds in Virginia and 
Wisconsin, as compared with the early fruit-bud formation in Cali- 
