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149 
On the relation between sugar content and 
winter rot in the garden carrots. 
LIBRARY 
By Karl B. Kristofferson. lUMIUA liNlVkRüd 
Some analyses of the sugar content in the common 
cultivated garden carrots, made in february 1918, gave 
the start to this study. 
As the analyses made in this year had a practical 
purpose, only, the method used by »Sveriges Utsädes- 
förening», Svalöv, in the case of roots was also employed 
in my work. The method may be well known in most 
of the laboratories working with roots. I think it well, 
however, to give a short description of it. 
Th^ roots to be analyzed are carefully washed and 
• put up on shelves whith numbered boxes. When quite 
dry on the exterior they are bored in a boring-machine, 
constructed for this purpose. Then a fine pulp is ob- 
tained. In order to determine the percentage of sugar 
a fixed quantity is weighed and then extracted accor- 
ding to Krüger’s method (König 1911). The percentage 
of sugar is then obtained by polarization in the polari- 
zation apparatus of Soleil-Yentzke. 
Table 1. 
The percentage of sugar obtained by polarization. 
February 1918. 
Variety 
St. Valery 
Guerande 
Nantes 
Parisian 
carrot 
% Cane-sugar 
. -f-2.17 
-f- 1.04 
4“ 0.77 
— 0.12 
The values of the sugar percentage are shown in 
table 1. It appears from this table that there is a ra- 
ther great difference between the different varieties. 
The negative value obtained in one sort, viz. Parisian 
carrot is striking. Evidently, an inversion of the cane- 
Botaniska Notiser 1921. 11 
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