May 1, 1868.] 



HARDWICKE'S SCIENCE-GOSSIP. 



103 



the one formed of a series of three elongated cells, 

 the other a flattened disc-like form terminating a 

 short stem of three or four cells. The branched 

 hairs of the Lavender are also intermingled with 

 others terminating in a glandular appendage which 



Fig. 8,". Hair of Money wirt. 



Fig. 88. Hair of Geum. 



Fig. 89. Hair of Cactus. 



Fi°\ 90. Hairs of Dead Nettle. 



1 1 



Fig:. 91. 

 Hair of Cabbage. 



Fig. 92. 

 Hair of Plane. 



Fig. 93. Hair of Spiderwort. 



contains the essential oil that gives to this plant its 

 peculiar odour. On the petal of the Heartsease 

 may be found three varieties of hairs. The hairs 

 or spires of some of the cactus tribe are like a 

 series of spear-heads placed one upon another. The 

 Southernwood hair is composed of a chain of cells, 



of which the three lower form the stem of the hair 

 while the two upper are lengthened into lateral 

 branches. The leaves of the Chrysanthemum and 



Fig. 91. Hair of Dock. 



Fig- 95. 

 Hair of Marvel of Peru. 



Fig. 96. 

 Hair of Cactus. 



Fig. 9,-. Hair of Southernwood. 





Fig. 93. Hair of Chrysanthemum. 



Fig. 99. Hairs of Heartsease. 



the Wallflower also bear T-shaped hairs, the former 

 springing from a series of cells that decrease in size 



