BUD-MUTATION IN THE POTATO AND ITS AGRICULTURAL SIGNIFICANCE 115 
tion. For the variety „Eigenheimer” the number amounts to 21, for 
the „Red Star’’ to 12, for the , Bravo” to 5 and for other varieties to 15. 
It could be shown, experimentally, that the „Eigenheimer” (yel- 
low tuber (Pl. 1, fig. A), flat leaf, second early) has produced the fol- 
lowing budmutants: 
1. Blue Eigenheimer: Tubers were found in which a sharply de- 
fined sector was blue while the rest remained yellow. Those tubers 
were then cut up into a number of pieces, with the result that the blue 
pieces produced plants with blue tubers while the yellow pieces produ- 
ced plants with yellow tubers. In the two subsequent years, the same 
results were obtained (see the figures 6, 7, 8, 9and 10, p. 56, 57). Occa- 
sionally however reversion occurs. (Pl. 1, fig. C,a „blue Eigenheimer’’). 
2. Pale blue Eigenheimer : On one stem there occured both yellow- 
ishly coloured and pale blue tubers. (Pl. 1, fig. D). The yellow tubers 
produced normal ‚„Eigenheimer’ plants, the pale blue ones, pale 
blue ones again; the foliage of those latter plants was not an even 
green, the plants themselves remained shorter and gave a smaller 
yield. On two occasions a reversion to normal plants was found. 
3. „Gold margin”: These plants show a short leaf with deeper 
nerves and a yellowish green margin (see fig. 4, p. 41, left gold margin, 
right normal). Often leaves with a gold margin and normal leaves are 
found on one stem (see illustration the one to left with a gold margin, 
the one to the right: normal). By means of appropriate cuttings, both 
forms can be grown from one plant. The „gold margin’ form often 
gives rise to reversion, a striking example is shown in fig. 16, p. 65, 
the left half being normal, the right one, a „gold margin”. 
4. „Raspberry leaf”: From one tuber a normal stem and a stem 
with long drawn out, deeply nerved, spoon shaped leaves bent dow- 
nards, reminding one of the leaf of a raspberry bush, was grown. (Fig. 
5, p.42, to the left: normal leaf, totheright:raspberry leaf). The plants 
with raspberry leaves were low, and produced a great number of 
tubers. 
5. „Males” (,bolters’’). , Bolters’”’ occur rather frequently. In 1922 
a plant was found two stems of which were normal,while one stem was 
considerably taller and ripened later. Towards the time of ripening, 
that plant was carefully dug up, 6 tubers became detached from the 
stolons, the others remained on the stems. 
The three tubers from the male” stem, gave 3 ,,males”’. 
