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in a natural way, or whether they are urged to rapid production of 
bulbils through crucial incisions in the discus. 
I know of no variety that grows so slowly. 
That is why of the 
2°¢ dwarf I possess only 20 bulbs after eleven years’ careful culti- 
vation. The 1st dwarf is still slower in its growth. 
The roots of the dwarfplants are thinner than those of the parent- 
variety. 
as those of dwarf n°. 2. 
Never did I come across hyacinth-species with roots as thin 
Ill. Cytological inquiry into the two dwar f-shapes. 
In the autumn of 1920 and in 1921 I have fixated repeatedly 
the root-tops of 1 bulb of dwarf n°. 
bulbs of dwarf n°. 
1, in 1921 the root-tops of 3 
2. The fixation was performed with Flemming’s 
solution and glacial acetic vinegar. My wife has performed the rest 
of the technical work. 
The investigation of the root-sections showed very distinctly that 
the somatic nuclei of dwarf n°. 
MAD 
Fig. I. Dwarf n°. 1: a, stoma (Oc. 4, 
Obj. D, Zeiss.); 6, pollengrains (Oc. 2, 
Obj. D); c, subepidermal cells of the tepals 
(Oc. 2, Obj. D); d, epidermal cell of the tepals 
(Oc. 2, Obj. D); e, cells of the outer bulb- 
scales Oc. 2, (Obj. D). Dwarf n° 2: f, cells 
of the outer bulbscales (Oc. 2, Obj. D.) 
1 consisted of 18 chromosomes and 
GS ee a i 
Fig. Il. Queen of the Pinks: a, stoma; 
b, pollengrains; c, subepidermal cells of 
the tepals; d, epidermal cell-of the tepals; 
e, cells of the outer bulbscales. 
Magnification as in fig. I. 
Proceedings Royal Acad. Amsterdam. Vol. XXIV. 
