118 ButTLerR: SUGAR IN TUBERS OF SOLANUM TUBEROSUM 
The buds in potatoes tend to be more numerous around the 
apices, and one would expect, therefore, that during the rest 
period as well as at germination metabolic activity would be 
greater in the apical portions. One of the consequences of this 
increased activity in the apices of the resting potatoes would be a 
lesser accumulation of sugar and the difference in the percentage 
present, as one proceeded towards the base, would be the more 
noticeable, the less ready the translocation of the sugar from one 
part of the tubers to another: from the seats of lesser activity to 
the seat of greater activity. The data given in TABLE Iv as well as 
the qualitative results illustrated in PLATE 2 show rather definitely, 
it seems to me, that there is little if any translocation from remote 
to budding parts even in germinating potatoes. Were the trans- 
location of sugar a normal and necessary function in the metab- 
olism of germination, its distribution would be more regular and 
constant; one would find a definite relation existing between cause 
and effect. The distribution of sugar (when present) in germi- 
nating and resting potatoes is not essentially different,* and it 
would seem, therefore, that its appearance in quantity just before 
or at germination should be ascribed, at least in part, to metabolic 
changes induced by another agent, or other agencies. 
DurxHaM, NEw HAMPSHIRE. 
Description of plate 2 
Fic. 1. Longitudinal section through Early Ohio from cellar, 16th May 1912. 
Fic. 2. Longitudinal section through Early Ohio stored in ice chest 20 days, 
16th May 1912, Compare with Fic. 1 
Fic. 3. Longitudinal section through Rural New Yorker from cellar, March 
Igit. 
x ea 4. Longitudinal section through Early Ohio from cellar, 16th May 1912. 
. 5. Longitudinal section oe Early Ohio stored in ice chest 20 days, 
16th ioe Igr2. oe are with FIG 
Lon 
pie tudinal section of ae Ohio from cellar, 26th April 1912. 
Fic. 7. Lon Salta section of Early Ohio from cellar, 8th March rorr. 
Fic. 8. Leann section through Triumph from cellar, March rort. 
Fic. 9. Longitudinal section through Triumph from cellar, March 1o1I. 
“* It is well to point out that germinating potatoes as well as resting potatoes 
may contain no sugar (cf. FIG. 6). 
