302 ODOROGRAPHIA. 



(a). The soap is completely soluble — Jajoanese luax. 

 (h). The soap partially soluble — African Bees vmx. 



2. The chloroform solution becomes cloudy on cooling : 



A. Alcoholic solution of acetate of lead gives, with the 



alcoholic solution of the wax, after a few minutes 

 standing, a cloudiness — vxixfrom Stick-lac. 



B. Alcoholic solution of acetate of lead gives no cloudiness. 

 (a). The ethereal solution of the w^ax becomes cloudy on 



the addition of an equal volume of alcohol — Brazilian 

 vjax. 

 (h). The ethereal solution remains clear — Bahia. wax. 



Eeflection on the plants yielding from the ducts and glandular 

 hairs on the surface of their leaves aromatic products suitable for 

 blendiug with other materials for purposes of fumigation, leads to 

 the consideration of the gum Ladanum. 



Ladanum or Gum Cistus. 



This gum, which at the present time is chiefly used by the Turks 

 for fumigation, and to some extent as a perfume, is an excretion 

 from the short glandular hairs with which the exceedingly viscid 

 leaves of Cistus Lada/niferus, Cistus Creticus, and some other allied 

 species, are covered. It is collected in the manner hereafter 

 described. The plants of the genus Cistus, — nat. ord. Cistinece, — 

 numbering about forty species, are mostly handsome shrubs from 

 "Western and Southern Europe, and Xorth Africa. Some of the 

 species are hardy in the South of England, and are commonly 

 known by the name " Eock Eose." 



Various plants of the genus Cistus are found dispersed over the 

 whole island of Cyprus, but occur in abundance only in the 

 neighbourhood of Baphos, a small town surrounded by lofty moun- 

 tains. The plants (which in this locality appear to have a more 

 powerful and balsamic odour, and to exude more resin than those 

 elsewhere) are called by the inhabitants of Cyprus 'BvcrTcipta, 

 Xystaria, a word probably corrupted from the ancient name klo-to^^, 



