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a temperature fluctuating between 70° F. and 60° F. They were 
not placed in pots, and afterwards not forced to early florescence, 
but between October 26 and November 1 planted in the open ground 
outside. In this way all bulbs had been treated which are grouped 
under category B and developed abnormal pollen-tubes. 
Very remarkable was the phenomenon that I observed in the 
plants belonging to category C. These were all cultivated by the 
same grower, of whom I examined 25 varieties (19 single-flowered 
and 6 double-flowered), with which I effected 31 numerations. 
Of six varieties 2 numerations were noted. These were varieties 
which had been grown in 2 lots, under different conditions. In 21 
of the 31 cases the pollen diverged more from the normal aspect 
than that of the same varieties classed under all other categories. 
In 5 cases I could not compare it with that of other categories 
because for them I had no racemes at my disposal. In the remaining 
cases it was found in the same condition or in one a little better 
than that of any other category. 
In a very striking manner it now appeared to me that the racemes 
with pollen showing Némuc’s phenomenon or transitions from the 
normal aspect to Nemuc’s phenomenon, always originated from bulbs 
dug up in an unripe condition, between July 1 and 15. Immediately 
after the digging up artificial heating was started, till September 20, 
from 75° to 80° F.; afterwards till the planting time, which was in 
October, from 70° to 75° F. The planting was done in the open ground. 
My observations have induced me last sommer to purposely subject 
several hyacinth-bulbs to various exterior influences. From these 
Fig. 1. (Oe. 2, Obj. A. of Zeiss). Fig. 2. (Oc. 2, Obj. D. of Zeiss). 
