348 BOTANICAL GAZETTE [APRIL 
plants were produced, indicating that but one bud germinated and 
developed from each tuber. The actual growing period of the 
plants above surface averaged 95 days, while the period of time 
from planting to harvest averaged 159 days. In this series the 
old seed tubers were recovered and planted. 
TABLE II 
eae a No. of potatoes 
. A est period in E eight of cro 
No.of res | Pam greet | Poser | Noweptinr® | MWat go | orga 
Tae eee Winter Original a 491.0 II 
Bee oies Winter Original 4 Si3.2 13 
j | See es No rest Seed of ] I 230.8 6 
Th Ai No rest Seed of I I 208 .0 3 
Se aa 56 Seed of ] 3 300.0 8 
LE eee 56 Seed of ] 3 263.0 7 
EV acon: No rest Seed of II I 437-9 ey 
WV oe. ING feat Seed of IT I 400. I 
Vo ae No rest Seed of III I 302.4 3 
Ne ne Oe No rest Seed of ITI I 280.5 2 
Vico ° Seed o 5 47-4 II 
Eee oes 230 Seed o 6 50.2 14 
bk ee 78 Seed o: 3 356.0 6 
Wikwee ss ive 78 Seed o 4 263.0 7 
WER vers 82 Seed o 3 Did not harvest 
gb ee Seed of IIT 4 Did not harvest 
UX No rest Seed of IV I 205.2 2 
LGU ae No rest Seed o I 287.3 3 
Cee eer ieee No rest Seed o I 295.1 : 
Mes Pes No rest Seed of V I 344.2 4 
The seed tubers for series IIL came from the crop of series I 
which were placed in a closet in the greenhouse and protected from 
sunlight. The seed consisted of whole tubers of about 100 gm. 
weight and had a rest period under greenhouse conditions of 56 
days. In this series the plants appeared above surface in 12 and 13 
days respectively, 3 buds sprouting and developing stalks in each of 
the pots. The actual growing period of the plants from the appear- 
ance of seedlings averaged 88.5 days, while the time from the day 
of planting to the day of harvest was 102 days. 
While the actual growing period of series III was about one 
week less than that of series II, the most significant effect of the 
56 days’ rest period of series III was to hasten the germination of 
the buds of the tubers and to produce plants of several stalks, 
instead of one, as was the case of the plants in series II. The 
