BULLETIN 895, U. S. DEPARTMENT OE AGRICULTURE. 
It is unfortunate that freezing points were not obtained from these 
lots of potatoes soon after harvest and then followed up periodically 
throughout the storage season. Subsequent work will be directed 
along this line. From the results here presented, a general tendency 
toward a rise in the freezing point as the season advances is evident. 
A fairly distinct varietal difference in freezing points is shown to be 
rather consistent. This is contrary to the statement of Jones, Miller, 
and Bailey. 8 The order in which the varieties freeze, beginning at the 
highest point, is (Feb. 12) Irish Cobbler, American Giant, Triumph, 
Rural New Yorker, Spaulding Xo. 4, Russet Rural, Green Mountain; 
(Feb. IS) Irish Cobbler, Giant, Rose, Triumph, Rural New Yorker, 
Russet Rural, Green Mountain; (Mar. 5) Irish Cobbler, Triumph, 
Spaulding Xo. 4, Russet Rural, American Giant, Rural Xew Yorker, 
Green Mountain; (Apr. 1) considering only the above-named seven 
varieties, first, Irish Cobbler, then Triumph, Spaulding Xo. 4, Russet 
Rural, American Giant, Rural Xew Yorker, and Green Mountain. 
It is seen that the varieties in general follow in nearly the same order, 
there being some shifting of position with some of the varieties having 
intermediate freezing points. 
Table II. — Freezing points of 18 varieties of potatoes 
groups. 
arranged according to family 
Group and variety. 
Freezing point. 
Group average. 
C F. 
c c. 
°F. 
°c. 
Triumph: 
Triumph 
Early Prospect 
29.20 
2S.S0 
29.67 
29.00 
28.97 
29.17 
-1.56 
-1.74 
-1.30 
-1.67 
-1.69 
-1.57 
} 29.04 
1 29.21 
29.17 
29.33 
} 28. 56 
1 28. 59 
| 28.96 
28.16 
-1.65 
Cobbler: 
Irish Cobbler 
First Early 
-1.55 
Xew Earlv Standard 
Michigan: 
-1.57 
Rose: 
Spaulding Xo. 4 
Green Mountain: 
29.33 -1.48 
2S.50 -1.95 
2S.63 -1.87 
28.70 -1.S4 
-1.48 
Gold Coin 
—1.91 
Rural: 
Rural Xew Yorker 
Russet Rural 
28.32 
28.77 
29.10 
28.76 
2S.71 
-2.05 
-1.79 
-1.71 
-1.80 
-1.83 
-1.95 
1 nited States Seedling Xo. 3S774 
Up-to-Date: 
, Up-to-Date 
Producer 
Oregon White Rose 
-1.74 
British Queen 
Peachblow: 
Garnet Chili 
Uncertain: 
American Giant * 
29.27 -1.52 
2S.16 -2.14 
29.64 —1.31 
-2.14 
1 It is somewhat uncertain in what group the American Giant belongs. Judging from its parentage, 
it possibly should belong with the second section of the Green Mountain group, but since its freezing point 
is so widely different from the rest of that group it is shown here by itself. 
In Table II all the 18 varieties are divided into family groups, 
according to Stuart. 9 The results shown in Table II were obtained 
8 Jones, L. R., Miller, M., and Bailey, E. Op. cit. 
8 Stuart, "William. Group classification and varietal descriptions of some American potatoes. U. S. 
Dept. Agr. Bui. 176, 56 p., 19 pi. 1915. 
