163 
of Fehling. The values obtained can not be quite exact, 
it is true, but they may yet be exact enough for prac- 
tical purposes, as well as the common polarization method 
used in selecting sugar-beets. 
The material has been rather small; it therefore 
appears desirable to verify the results by analyses of a 
greater number of individuals and of sorts during several 
years. However, as the parallelity between the relative 
percentage of invert-sugar and the rot resistance, in the 
average proofs as in the individual proofs, is too tho- 
rough-going, to be only chance facts I have thought it 
well to publish the results obtained already at this stage. 
Furthermore, I do not know if I shall be in a position 
to follow up the work started. 
I take the the occasion to extend my thanks to 
Mr. G. Nilsson-Leissner for his kindness of assisting 
me in my work on the sugar analyses. 
Literature cited. 
Helweg, L. 1882. Redegerelse for de av Forening till Kulturplan- 
ternes Forbedring i 1889 austillede Dyrkningsforseg. Tidskr. 
Planteavl. 
Jekelius, W. 1912. Inversion des Rohrzuckers und ihre Beziehungen 
zu den qualitativen Veränderungen verschiedener Futterrüben- 
sorten während der Lagerung. Kühn-Archiv. Bd 2. 
Kristensen, R. K. 1916. Sukkerbestemmelse i He og Roer. Tidskr. 
Planteavl. Bd 28. 
König, J. 1904. Chemie der menschlichen Nahrungs-und Genussmit- 
tel. Berlin. 
König, J. 1911. Die Untersuchung landwirtschaftlich und gewer- 
blich wichtiger Stoffe. Berlin. 
Stephani, W. 1911. Untersuchungen über reducierenden und nicht 
reduzierenden Zucker in den Beta-Rüben während des Wach- 
stums und der Lagerung. Kühn-Archiv. Bd 1. 
