78 
BULLETIN 813, IT. S. DEPARTMENT OF AGRICULTURE. 
shows that with the trees of the Eureka, Small-Open, and Dense- 
Productive strains the period of highest seed content corresponds in 
general with the time of the heaviest production of fruit. 
Table XVIII. — Average number of seeds per fruit picked from lemon trees of the various 
strains of the Eureka variety in the investigational performance-record plat during each 
month of the 5-year period from July. 1911. to June. 1916. inclusive. 
Num- 
ber 
of 
trees. 
Description of trees. 
July 
Aug. 
Sept, 
Oct. 
Nov. 
Dec. 
Jan. 
Feb. 
Mar. 
Apr. 
May 
June 
For 
the 
pe- 
riod. 
76 
7.13 
6.87 
5.25 
6.75 
6.18 
3.00 
2.75 
2.38 
1.93 
6.27 
6.36 
6.69 
5.00 
5.32 
3.60 
2.38 
1.92 
1.67 
4.83 
5.20 
6.59 
4.39 
4.16 
1.13 
1.82 
1.52 
1.40 
4.00 
3.50 
3.00 
2.86 
3.33 
1.60 
1.97 
2.01 
1.28 
3.99 
3.54 
2.22 
3.08 
3.14 
.57 
1.17 
.94 
4.18 
4.46 
3.69 
3.07 
3.29 
1.18 
.68 
.53 
.78 
5.13 
6.04 
4.33 
4.49 
4.15 
1.21 
.95 
.94 
.99 
8.06 
8.93 
7.50 
7.22 
6.64 
3.05 
1.58 
1.26 
1.57 
9.62 
9.29 
8.42 
8.07 
8.15 
2.25 
3.46 
2.66 
3.00 
12.23 
11.85 
10.52 
9.90 
10.29 
4.06 
3.57 
2.41 
3.6.5 
10.92 
10.63 
11.80 
9.81 
9.11 
3. 95 
3.78 
3.41 
3.16 
9.67 
8.46 
9.20 
8.80 
8.30 
3.72 
4.38 
3.65 
2.76 
7.10 
10 
2 
10 
117 
Highest producing (all 
Eureka strain) 
Dense-Productive strain... 
Small-Open strain 
7.02 
6.51 
6.03 
5.92 
2 
10 
10 
17 
Pear-Shape strain 
Dense-Unproductive strain 
Lowest producing (irre- 
spective of strain) 
Shade-Tree strain. 
2.34 
2.26 
1.90 
1.84 
COMPARATIVE VALUE OF THE STRAINS. 
The individual-tree performance-record studies of the Eureka 
lemon strains, and observations of typical trees of these strains in 
many orchards in different citrus districts have led to certain con- 
clusions as to the comparative value of the different strains for com- 
mercial lemon production in California under existing cultural and 
marketing conditions. 
In the Eureka variety only the Eureka, or Productive, strain has 
given satisfactory production from all standpoints. Its tendency to 
produce fruits throughout all seasons of the year is a valuable one. 
This characteristic of continual bearing has been the main reason for 
the planting of the Eureka variety by citrus growers in many districts. 
The fruits of the Eureka strain are of desirable shape for making a 
satisfactory commercial package. The juice has a high percentage 
of acidity and is of superior quality. The fruits, after curing, develop 
a smooth texture of rind, have a light yellowish or strawlike color, 
giving them a waxlike appearance, and remain solid and firm when 
handled in the. market. 
The Variegated strain is of some value in a very limited way, par- 
ticularly for ornamental purposes. The striking appearance of the 
striped leaves and fruits has led many persons living in the citrus 
districts of California to grow one or more of the Variegated trees in 
their home grounds. The fruits, while of little commercial value, 
are of fair quality for home use. 
The other strains of the Eureka variety studied in these investiga- 
tions are of little or no commercial value. Some of them, such as 
the Shade- Tree, the Pear-Shape, and the Sporting strains are actually 
