STRONG DRINK AND TOBACCO SMOKE. 67 



tiful transparent hairs, each composed of a string, or 

 bead, of square-shaped cells, joined together ; these 

 gradually diminish in size towards the end of the hair, 

 which terminates in a slender, transparent filament of 

 very great length. The bases of these hairs are 

 compound (Plate 9, fig. 7). 



The leaves of the chicory plant have a peculiar interest 

 in connexion with the subject of tobacco adulteration. 

 Some years ago, tons of these leaves steeped in tar oil 

 were seized in Ireland by the revenue officers on the 

 premises of a cigar maker, by whom they had been 

 freely used as '\fillers" for pure Havannahs, and so 

 good was the sophistication, that many practical men 

 were actually deceived by them. When the leaves were 

 unrolled their margins (Plate 10, fig. 1) at once told 

 a tale, and when their skins were stripped and examined 

 under the microscope they told another, for attached to 

 them were discovered an abundance of minute hairs, as 

 unlike those on the tobacco leaf as could be well imagined. 

 For about a third of its length each hair is composed 

 of a number of oblong cells, laid side to side, and end 

 to end ; these gradually lessen in number until they 

 form a row of single cells joined together, the hair 

 being finished by a single cell, curiously curved. A 

 cluster of cells form a compound base to each hair 

 (Plate 10, fig. .3). 



Among the simplest forms of hairs are those which 

 form the peculiar down on the under surfaces oi fox- 

 glove leaves. They are simple filaments of single oblong 



F 2 



