THE HAIRS. 103 



confound them with true lymphatic hairs, which some- 

 times exist upon the same organs: thus certain standards 

 of the Leguminos«, or certain corollas of tlie Campanu- 

 lace^e, present hairs which appear like ordinary ones, 

 whilst the stamens of Verhascum and Tradescantia 

 have them very different. The function and use of 

 Corolline Hairs, are still more difficult to determine than 

 those of the Lymphatic, and all their history is at present 

 very obscure. I only mention them to draw the atten- 

 tion of observers to them. 



Section V. 



Of Scaly Hairs, 



Under the name of Scaly Hairs I here designate 

 a particular kind, of a dry and scaly nature, which, in 

 different parts of living plants, are presented in a dead 

 or atrophied state, and which hardly enjoy more than 

 the hygroscopic property inherent in vegetable tissue : 

 this property is so much the more perceptible, the more 

 completely the hairs are devoid of sap. Of this kind 

 are the hairs, expanded into scales, which are found 

 upon the petioles of the Fern ; those which compose the 

 pappus of the Compositae, Dipsaceae and Valerianeae ; 

 the tufts which grow upon the glumes of grasses, or 

 those which surround the fruit of Erio'plwrum ; the long 

 hair which arises from the seeds of the Onagrarise, and 

 of several Apocineas ; the hairs wliich cover the seeds of 

 the Cotton-plant {Gossypium), and those of Bombay, 



