662 



BOTANY AND PHARMACOGNOSY. 



from Aloe Perryi, and probably other species of Aloe, growing on 

 the island of Socotra and in Eastern Africa, and exported by 

 way of Bombay; (2) Curasao (and Barbadoes) Aloes, obtained 

 from Aloe chinensis and Aloe vera, growing in Cura(;ao and other 



B 







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Fig. 275. Crystals from exudations and extracts: A, crystals found in the residue 

 after treatment of catechu with water; B, long prisms of catechin (d) found on treatment 

 of gambir with chloral solution, the crystals soon dissolving, and prismatic plates (e) 

 usually seen in glycerin mounts of gambir; C, crystals from aloes, including aloin (a), 

 broad prisms (b) from Barbadoes aloes, and plates (c) from Cape aloes; D, crystals of 

 benzoic acid obtained by subliming benzoin on a slide or in a watch crystal. 



islands of the Dutch West Indies; and (3) Cape and Uganda 

 Aloes, obtained probably from Aloe ferox, growing in Southern 

 Africa, and exported from Cape Town and Mossel Bay. 

 The leaves of the Aloe plant are cut transversely and the juice 

 which exudes is allowed to evaporate spontaneously, it being 



