157 
Table 4 shows the percentage of sugar and the 
result of the storing of the individual proofs. The roots 
marked with W. havè wintered quite well; those marked 
with R. are rotten. 
The percentage of total-sugar as well as of invert-sugar 
varies very much in the different sorts. The correlation 
between them is doubtful, even here; nor is there any 
correlation between the total percentage of sugar and 
the rot resistance. It is much more evident between 
the rot resistance and the percentage of invert-sugar, 
just as in the case of the average proofs. However, 
it is in this case as in the former the relative percen- 
tage of invert-sugar that shows the most pronounced 
correlation to the rot resistance. 
When viewing the table one gets the impression 
that the »critical point» of the rot resistance is located 
at a relative percentage of invert-sugar of about 45—- 
50 ^ ; that is to say, the varieties with about half of the 
cane-sugar inverted in the beginning of winter have^ a 
doubtful rot resistance. The roots will probably rot if 
a greater percentage of the cane-sugar has been inver- 
ted at this time. If the percentage of invert-sugar is 
less than half of the total percentage of sugar it is 
probable, on the contrary, that the roots will keep sound 
during the storing. It is not impossible, however, that 
this »critical point» varies with the year. This is pro- 
bably the case. 
Among the 39 roots analysed as individual proofs 
only 3 have been found to form an exception from this 
rule, viz. nos. 15, 17 and 37 ; all belonging to Guerande. 
More than half of the cane-sugar is inverted in these 
cases but in spite of this fact all have wintered quite 
good. 
The cause of this exception is doubtful. The ana- 
lysis might have been incorrect. The quantity of pulp 
obtained by the borings was too small indeed to permit 
