L1LIACE2E. 475 



prolonged treatment with nitric acid, yields chrysammicj aloe- 

 tic, picric, and oxalic acids as zanaloin and barbaloin do. 



Jafarabad aloin, wben treated with potassium chlorate in a 

 hydrochloric acid solution, yields a chloro-body resembling 

 that given by zanaloin, and when heated with acetic anhydride 

 gives an acetyl compound sin^ilar to acetyl -zanalqin. 



-Both of them, when treated with strong sulphuric acid and 

 potassium bichromate, give a violet coloration closely resem- 

 bling that given by strychnia, but c^uickly fading to green. 



Those r-esults seem to leave no doubt that the aloin of 

 Jaf^raba^ aloes is identical witl^ that from Zanzibar aloes, 

 tliQugh the colour of the former is distinctly a lighter shade of 

 yellow than that of the latter. 



The main points of difference among the aloins may be tabu- 

 lated thus : 



1, Nataloin obtained fron; Natal aloes, yields only picric and 

 oxalic acids by treatment with nitric acid. Is not reddened, 

 even on heating, by that re-agent. 



9. Barbaloins yield cl^rysamaiic, aloetic, picric, and oxalic 

 acids by treatment with nitric acid. They may be divided into 



(A) ^"barbaloin, obtained from Barbadoes or Moka aloes. Is 

 reddened in the cold by ordinary strong nitric acid. 



(B) 6-barbaloin, obtained from Socotrine, Zanzibar, and 



Jafarabad aloes. Is not coloured bv cold nitric acid, but 



gives an orange 



in the cold with fuming nitric acid. {Shen- 

 stone in Phar. Joiirn., Dec, 1882.) 



Conwierce. — Bombay is the centre of the Aloes trade in the 

 East and imports from Arabia (and Socqtra through Aden) 

 yearly about 1,500 cwts. of the drug valued at about Bs. 30,000, 

 Of this quantity from 300 to 400 cwts. (chiefly Socotrine) are 

 re-exported to Europe, and 200 to 300 cwts. to Eastern ports, 

 the remainder being consumed in India. 



Madras and Sind occasionally export small quantities of 

 Indian aloes to Eastern ports. 



