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STEWART: TUBERS OF SOLANUM TUBEROSUM 42 
To one familiar with Gager’s interesting paper! on ingrowing sprouts of 
potato tubers it appeared probable that tubers forming on ingrowing 
sprouts had enlarged until the pressure produced became sufficient to 
rupture the tissues of the parent tuber. Upon dissection of the 
tubers this was found to be true. 
Fic. 3. The specimen shown in Fig. 2 with one side cut away to show the 
origin of the ingrowing sprout which bears the new tuber. A slight change in pose 
has brought to view a second new tuber. Nat. size. 
The old tuber shown in Fig. 2 was carefully dissected to determine 
the origin of the sprout bearing the new tuber which was emerging 
from a slit at the bud end. It was found to have started from the 
‘“eye’’ on the right side of the old tuber where the two external, sessile 
new tubers are seen. Fig. 3 shows the same tuber, in a slightly 
different position, with the tissue cut away so as to expose the new 
tuber and the sprout bearing it. In accomplishing this one of the 
1Gager, C. Stuart. Ingrowing sprouts of Solanum tuberosum, Bot. Gaz. 54: 
515-524. I912. 
