UTAH ACADEMY OF SCIENCES 137 
weight of fruits over the parental average amounting to 
from 3 to 17 per cent. Along with the hybrid vigor 
_ they also obtained a hastening of the time of production. 
Stuckey of Georgia, (1916) working on disease 
resistance of tomatoes found that both resistance and 
susceptibility to blossom-end rot were apparently trans- 
mitted from parent to progeny. 
At the Utah Agricultural Experiment Station, we 
began in 1918 a preliminary study of tomatoes from the 
standpoint of yield, earliness, and quality of fruit. The 
work was begun with seeds of sixty-six varieties from 
sixteen reliable seed companies and there was a total of 
ninety-four strains of these varieties. The object of the 
work was to select and breed early maturing, high yield- 
ing, and high quality strains of tomatoes more suitable 
than the kinds now used in Utah. 
One of the outstanding features of the first two 
years of study is the difference in yield between different 
varieties, the difference in yield between plants of dif- 
ferent strains of the same variety, and the difference in 
yield between plants of the same strain. In the case of the 
“Stone” a difference of nine pounds per plant of ripe 
marketable fruits was recorded from separate strains. 
On the basis of 6,000 acres of tomatoes in Utah, this 
would mean a loss of about 67,500 tons of fruits if all the 
farmers bought the poorer strain of ‘Stone’. In the 
case of Earliana a difference of twelve pounds per plant 
between strains was recorded. Chart No. 1 [Charts 
shown but results not here entered] indicates a difference 
in yield of twenty-five pounds per plant, between differ- 
ent varieties. 
Another outstanding feature is the difference in ear- 
liness of maturity between different varieties, different 
strains of the same variety and different plants of the 
same strain. Chart No. 2 shows the relative earliness of 
three varieties. ‘“‘Chalk’s Early Jewel” begins its heavy 
production September ist; “Landreth’s Red Rock,” Sep- 
tember 13th; Stone, September 20th. Up to the mean 
frost date, September 25th, these varieties yielded 
respectively 12, 8, and 6 pounds of marketable fruit per 
plant. Obviously, if the excellent quality and firmness . 
of the Stone could be combined with the earliness and 
