EXPLANATION OF THE PLATES. XXI 



Fig. 11. Subulate erect hair, also articulated, (p. 640). 



12. Blunt, erect, articulated hair of Atropa Belladonna, (p. 640). 



13, 14. Hooked hairs, which produce the velvety feeling of the 



surface of some leaves, (p. 640). 



15. A stipitate gland, (p. 636). 



16. Branched hair of Marrubium peregrinum. (p. 641). 



17. Stellated hairs of Althaea officinalis. (p. 641). 



18. Awl-shaped bristle of Symphytum orientate, (p. 642). 



19. Barbed bristle of Mimosa sensitiva. (p. 642). 



20. Subulate hollow bristle of Borago officinalis. (p. 642). 



21. Sting of the nettle: a. the subulate hollow bristle ; b. the 



cellular bag or sponge containing the poison ; c. natural 

 size of the sting (p. 642). 



22. Spindle-shaped bristle of Malpighia urms. (p. 643). 



23. 24. Forked bristles, (p. 644). 



25. Bristle of Humulus lupulus (p. 644). 



26. Fasciculate bristle of C&ctasflageltiformis. (p. 644). 



27. A papillary gland ; a. the gland, much magnified ; b. its 



real size. 



28. A. Two series of compound papillary glands moderately 



magnified. B. one of these glands highly magnified ; a. 

 six distinct glandules ; b. the excretory pore ; c. a similar 

 pore free from obstruction, (p. 634). 



29. A. A squamous gland moderately magnified : B. one of 



these glands, highly magnified ; b. the scaly border; c. 

 the gland, (p. 633). 



30. A cup- shaped gland, (p. 635). 



31. A knob-shaped gland, (p. 636). 



32. A branched pediculated gland, (p. 636). 



PLATE X. 



1. Part of a leaf of Cotyledon calycinum: a. a. a. a. a. young 



plants springing from the serratures of the leaf. (p. 642). 



2. Skeleton of the leaf of Ficus religiosa; a. the midrib; 



