160 
the percentage of invert-sugar varies in correlation to the 
percentage of total sugar or to cane-sugar, or if the 
greater ,or lesser ease by means of which the-inversiôn 
takes place is a sort character.. In fact, a definite an- 
swer to this question cannot be given when populations 
are used, even if very extensive. It becomes necessary 
to .make crossings between an individual with high per- 
centage of total sugar and a low percentage of invert- 
sugar and an individual with a low percentage of cane- 
sugar and a high percentage of invert-sugar. The ana- 
lysis of a great number of F 2 -roots from this cross com- 
bined with experiments as to the rot resistance during 
winter would help us to give an answer to the question 
if the correlation found to exist between the rot resi- 
stance and the relative percentage of invert-sugar only 
is a chance combination in the sorts experimented upon, 
or if the greater rot resistance always is combined 
with a lower relative percentage of invert-sugar, and 
vice versa. 
The investigations made do not give any informa- 
tions as to the physiological connection between greater 
or lesser ease of the inversion of the cane-sugar, or be- 
tween the greater or poorer rot resistance. The invert- 
sugar will probably be found to be a better food sub- 
stance for the rot bacteria than the cane-sugar. 
A few words may be said about. the practical oon- 
sequenses of these investigations with regard to the 
breeding of garden carrots, and especially with regard 
to the breeding of sorts for late winter and early spring. 
If the results from this investigation prove to be 
correct and to be of general application a great value 
ought to be attached to the determination of the in- 
vert-sugar in the carrots. The results already at hand, 
may give a clue to the right handing of such an analy- 
sis for practical purposes. The following remarks may 
suffice. 
