1 \)TATO I N \’ESTJ(}ATU)N S 
7 
cellar weights they Avere deducted from the total field weights be- 
fore calculating the loss during storage. The yields of the different 
Amrieties, both before and after sorting, as well as the losses during 
storage and the per cent of marketable tubers, for the years 1915 
to 1918 inclusive, are given in tables 1 to 4. 
In determining the merits of the different varieties for commercial 
production a number of features must be considered. While a good 
yield is essential it is equally important that tubers of good shape 
and cooking quality be produced and that the variety be sufficiently 
resistant to diseases to prevent rapid deterioration. In 1915, the 
year in Avhich the greatest number of varieties was grown, the larg- 
est yield was obtained from the Green Mountain plats which were 
groAvn from the Wisconsin seed. The tubers, however, were of such 
inferior shape as to be scarcely fit for market. While the Peachblow 
ranked next in yield the large tubers of this variety showed the 
objectionable feature of cracking open during the process of growth. 
In 1916 this variety, groAvn from seed produced at the station the 
preceding year, shoAved a decided falling off in yield which was 
attributed largely to so-called ^‘running out’’ as the result of 
pathological troubles. Altho fairly good yields have been obtained 
from the Kusset Burbank, the tendency which this variety possesses 
of producing a second growth, or knobbed” tubers, renders it 
undesirable for conditions which obtain at the station. While the 
three varieties mentioned above produce good crops of excellent 
quality in localities to which they are adapted, they are apparently 
Fig. 2 — ^Tubers of the Peachblow variety: left, good type of tuber grown under favor- 
able conditions; right, cracked tuber, a type frequently found in the larger sizes when 
grown under conditions unsuited to this variety. 
