LIFE HISTOKY OF TIMOTHY 
39 
be distinctly seen rising in small clouds. It was observed that as the 
wind passed over a timothy meadow approximately half a mile 
away the clouds of pollen appeared as a haze over the field. Similar 
phenomena have been observed several times in fields of rye, but 
this is the only occasion at the timothy-breeding field station on 
JUNE 
JULY 
'28 29 30 T I 2 3 4 5 6 7 a 9 10 II IE 13 14 15 16 17 10 19 20 21 VLU>& X 
88 
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PERCENTAGE OF PLANTS IN FULL BLOOM 
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PERCENTAGE OF PLANTS MATURE 
Fig. 7. — Comparison of the percentages of timothy plants in full bloom 
(upper part of graph) and of plants matured (lower part) on, dif- 
ferent dates in 1917, in a row plat of F. C. I. No. 6162, an early- 
selection (continuous line) ; in a row plat of F. C. I. 6779, a late se- 
lection (line with cross marks) ; and in row plats of ordinary com- 
mercial timothy (dotted line). The first plant was in full bloom 
in these plats June 29 and the last one July 23 ; the first plant 
matured July 26 and the last one August 17 
which pollen of timothy has been observed to be carried by the 
wind in large enough quantities to form a cloud or haze visible at 
the distance of half a mile. 
The fact that the stigmas of timothy emerge before pollen is 
released from the anthers of the same floret and the ease with which 
the pollen is distributed by the wind indicate that timothy is natur- 
