Studies were undertaken to compare the qualitative composition of the alkaloids in the bitter and fodder biotypes of white lupin (isolated from hybrid material from fodder forms white I × white V). The results proved that the biotypes studdied, like analogous forms of other white lupin varieties, contain a number of identical alkaloids: sparteine, lupanine, 13-hydroxylupanine and 13-hydroxylupanine esters, they differ however in ithe content of some of the remaining alkaloids. In case of the bitter biotype angustifoline was obtained, while in case of the fodder biotype - an alkaloid thait has a similar chromatographic position however differs in the character of the IR - sepctrum. The latter compound is of saturated type and is probably a keto-derivative of sparteine (the possibility of oxylupanine occur-rence was chromatographically and that of oxyspartein spectrally excluded). In both forms the so cold ax fraction was found to be a mixture of several compounds. In bitter lupin it consisted among other substances of multiflorine and probably 13-epihydroxylupanine never found so far in any white lupin variety. In fodder lupin five components were observed, two of which corresponded chro-matographically to those isolated from bitter lupin. The remaining ones differed in the developing systems applied. Similary the components of the so cold ay fraction occuring in trace amounts seem to be different in both the biotypes of lupin.