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outlined. The sterility amounts to 40°/,. (The bulbs of these flowers 
and those of the former bad been subjected to high temperatures). 
4. The pollengrains stick together. They swell very soon; 11°/, are 
sterile. 
5. Like 4, but 15°/, are sterile. 
6. The pollengrains are taken from the flowers of bulbs that have 
not been planted. The flowers lay shrivelled up in the bulb. The 
pollengrains are slightly smaller than usual for the rest they look 
quite normal; 13°/, are sterile. 
7. The pollengrains are taken from a budvariety-in-colour of 
Moreno. The colour of the flower has become dark red from rose- 
red; 59°/, of the pollengrains were sterile in the only raceme I had 
at my disposal. 
8. The pollen is not sticky, the sterile pollengrains are ellipsoidical, 
triangular or globe-shaped; the sterility is 40°/,. 
9. The sterility is 8°/,. 
10. The sterility is 35°/,. 
Nimrod, single-flowered red, 19 chromosomes. 
1. The anthers are shrivelled and give the same impression as 
those of the variety Moreno of the same grower (c.f. 1). The pollen 
does not stick together. 1 do not find one fertile grain. The sterile 
ones are elleptic, round or triangular. 
2. The flowers are taken from a lot that blooms very early. The 
anthers are badly developed. The pollen shows beautifully Nemnc’s 
phenomenon. 
3. The flowers are taken from a lot that blooms late, coming 
from the same grower as those under 2. They are not yet open. 
The pollen shows, as in 2, Nemec’s phenomenon. 
4. All pollengrains, fertile as well as sterile, are normally formed ; 
26°/, are sterile. 
5. The flowers are taken from a lot that blooms early. The bulbs 
have been planted medio October, and on April 4 1919, the date 
when I cut the racemes, they have long roots. The anthers are 
normally formed, not shrivelled. The pollengrains at once swell in 
water, but they are sticky. Among the fertily pollengrains these are 
some that contain a more or less wide zone of water round a 
rounded mass of protoplasm. Some pollengrains have developed a 
short, wide pollen-tube; 36°/, are sterile. — 
6. The flowers are taken from a late-flowering lot of the same 
grower. The bulbs were planted on November 7, and on April 5'k 
the gemma rises only 2 cm. above the ground. The roots of the 
bulbs are still very short. The sterile pollengrains are all ellipsoidical, 
