Naturalisation in Extra- Tropical Countries. 31 



or other processes of exsiccation to dryness, the extract of aloes is 

 prepared. The bitter sap, used for dressing wounds, keeps oft' 

 flies very effectually. Deserves introduction particularly in 

 veterinary practice. All species are highly valuable, and can be 

 used, irrespective of their medicinal importance, easily and inex- 

 pensively to beautify any rocky or otherwise iriarable spot, 



Aloe ling-uiformis, Miller. 



South Africa. According to Thunberg, the purest gum resin is 

 obtained from this species. 



Aloe Perryi, Baker. 



Socotra, It is now known, that it was this species, which 

 furnished the genuine "Aloes," renowned in antiquity [Prof. B. 

 Balfour]. It grows best in limestone-soil, and ascends to 3,000 feet. 

 Flowers turning from scarlet to yellow. Closely allied to A 

 vulgaris. 



Aloe plicatilis, Miller. 



South Africa. The drug of this species acts more mildly than 

 that of A. ferox. 



Aloe purpurascens, Haworth. 



South Africa. Another of the plants, which furnish the Cape- 

 aloes of commerce. The South- African Aloe arborescens (Miller) 

 and A Commelyni (Willdenow) are also utilized for aloes, accord- 

 to Baillon, Saunders and Hanbury. 



Aloe spicata, Thunberg. 



South-Africa. This also furnishes Cape-aloes, and is an exceed- 

 ingly handsome plant. 



Aloe vera, Miller. (A. succotrina, Lamarck.) 



South-Africa. A purplish-flowered species, figured already by 

 Commelyn in 1697 [Baker]. Yields the common Socotrine-aloes 

 and Moka-aloes. 



Aloe vulgraris, Bauhin. (A. vera, Linne ; A. Barbadensis, Miller.) 



The Yellow-flowered Aloe. Countries around the Mediterranean 

 Sea, also Canary-Islands, on the sandy or rocky sea-coast. Such 

 places could also be readily utilized elsewhere for this and allied 



