382 The Botanical Gazette. [October, 
simultaneously. These hairs also show unusual differences of 
length. 
Coreopsis artstosa Michx. is very similar to the preceding. 
The hairs are of various lengths and diameters, have lateral 
canals, and are probably all duplex when perfectly developed. 
Flelianthus occtdentalis Riddell of the same group, is also 
very similar, except that the tip is perhaps less deeply cleft. 
Occasional specimens seem simple except for a line through 
the center, answering to the median wall. 
In Dysodia papposa (Vent.) Hitchcock, the hairs are rather 
more slender, double tipped, but show no division wall. 
In Centaurea Cyanus L. they are very long, slender, and in- 
distinct. No transverse canals are found, and the apex is 
sharply pointed. 
Botanical Laboratory, Towa Agrl College. 
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