Dec. 1, 1SG9.] 



HARDWICKE'S SCIENCE-GOSSIP. 



269 



hairs, glands, or stomata ? All these are questions 

 not yet satisfactorily answered, for want of a suffi- 

 cient number of observations having been recorded. 

 Even the examination of pollen-grains was pursued 

 satisfactorily, and with interesting and important 

 results, up to a certain point, and there left, no one 

 caring to continue those researches even when well 

 begun, and some of the difficulties removed. 



In a previous number of this journal I gave a few 

 illustrations of hairs following the stellate type, 

 although neither complete nor exhaustive; for it 

 was intended only to be suggestive, in the hope 

 that other students would follow in my steps, and 

 increase the number. On the present occasion ex- 

 amples are given of simple and branched hairs from 

 a few of the commonest plants. 



Fig. 231. 

 Linaria Cymbalaria. 



Fig. 232. 

 Lonicera Peric/ymenum. 



Eig. 231 is taken from the petal of the common Ivy- 

 leaf Snapdragon {Linaria Cymbalaria), which some- 

 what resembles an Irish shilalagh. The next (fig. 

 232) follows a similar type, and is derived from the 

 leaves of the Honeysuckle {Lonicera Periclymentim), 

 except that it is more decidedly clavate. Subulate 

 hairs bent or contorted like a meat-hook may be 



Fig. 233. Polygala vulgaris. 



found (fig. 233) on the leaves and stems of the 

 Milkwort {Polygala vulgaris), and similar hooks 

 (fig. 234) with a longer shaft, like the "pothooks and 

 hangers " of school-days, adorn the leaves of the 

 Comfrey {Symphytum officinale). 



Branched hairs are represented by the five suc- 

 ceeding figures, of which the first (fig. 235) may be 



found on the leaves of the Garden Rocket, whilst 

 the next has the forking more decidedly developed, 



Fig. 231. Symphytum officinale. 



and occurs on the leaves and stems of the Cat's 

 Ear (Hypocliaris radicata). A pretty garden plant, 



_^ 



Fig. 235. Garden Rocket. Fig. 238. Hypochmris radicata. 



Aubrietia deltoides, offers an example of a still more 



Fig. 23". Aubrietia deltoides. 



Fig. 238. Draba incana. 



complex form (fig. 237) not uncommon on Arabis 

 and other Cruciferce ; and fig. 238 is a hair from the 



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