155 
correlation is seen between the total sugar percentage 
and the resistance — the latter varies also much more 
than the former. However, between the percentage of 
invert-sugar and the resistance there is, on the other 
hand, a decided correlation. The lower the percentage 
of invert-sugar the greater the resistance. Thus the 
correlation is a negative one. This parallelity becomes 
even more striking if the quantity of invert-sugar in 
relation to the quantity of total sugar is conside- 
red and not the absolute percentage of invert-sugar, 
■ inve f sugar . 100. I call this value 
% total-sugar 
the relative percentage of invert-sugar. This value, 
shown in col. 3, table 2, compared with the percentage 
of rotten roots (col. 6), shows a striking similarity of 
variation. For comparison the results of storing in stack, 
the ordinary way of keeping the roots during the winter 
in practice, are seen in the table 3. I had no material 
of St. Valery , crop B, so this had to be left out. The 
parallelity between the relative percentage of invert- 
sugar and the rot resistance is striking also in this case. 
that is, the value 
Table 3. 
The results of storing in staek in 1920 — 1921 compared 
tvith the relative percentage of invert-sugar. 
Variety 
Nantes 
stock B 
St. Valery 
stock A 
Nantes 
stock A 
Guerande 
Parisian 
carrot 
Number of stored roots 
869 
262 
93 
903 
890 
Number of rotten roots 
27 
79 
46 
585 
705 
% of rotten roots 
3.1 
30.2 
49,5 
64.7 
79.2 
% relative invert sugar 
30.8 
42.4 
46.8 
53.7 
66.3 
The testing of the individual roots was made by 
means of borings. The bore-holes were then covered 
