426 BROOKLYN BOTANIC GARDEN MEMOIRS 
small external tubers was removed. The changed pose in Fig. 3 
brings to view a second new tuber not shown in Fig. 2. 
The larger of the new tubers was borne on a very short branch 
three centimeters from the point of origin of the sprout; and the 
smaller one on a similar branch about a centimeter beyond. The 
course of the ingrowing sprout was perpendicular to the surface of 
the parent tuber at the point of origin. Apparently, the direction 
of growth had been inward from the beginning. Close observation of 
this and some other specimens revealed nothing to indicate that the 
sprouts had started externally and turned inward. Whether it was 
the tip of the sprout or the expanding tubers which first broke through 
the cortex cannot be determined in this case; but in other specimens 
(among them the one shown in Fig. 1) tt was clear that the new tuber 
had been responsible for the rupture of the cortex. 
The ingrowing sprouts exhibited the lenticel-like openings observed 
by Gager. These signify nothing except that the sprouts were 
formed in a humid atmosphere. The fibrous roots observed by 
Gager were lacking and the sprouts were but slightly branched. 
The strange behavior of these tubers cannot be ascribed to low 
vitality. This is shown by the fact that a large number of tubers 
from the same lot were planted and a good stand of vigorous plants 
obtained. 
In the main, these observations agree with those made by Gager 
and add nothing to them except to show that tubers of considerable 
size may form on ingrowing sprouts and produce a striking freak of 
nature. The internal tubers observed by Gager were small ones. 
