(47) 



Lac 



Lac is an exudation produced on the stems of a variety 

 of Chinese trees, chiefly in the Euphorbiaceae, or Spurge 

 Family, as a result of punctures of the bark made by 

 insects known as "lac insects." 



1 163. Scab lac. The lac in its natural condition, as scraped off of the trees. 



1 164. Button lac. 



1 165. Raw shellac. 



1 166. Stick lac. 



Miscellaneous Resins 



Asphalt (Asphaltum) 



Asphaltum is a substance resembling pitch or tar in 

 appearance and composition, found in large deposits called 

 "asphalt lakes," in many countries. The manner of its 

 origin is not positively known, but its original source is 

 apparently vegetable. It belongs naturally near the resins, 

 and is also related to coal. 



1 167. Asphalt from Ohio. 



1 168. The same, from California. 



1 169. Gilsonite. A form of asphalt from Utah. 

 1170-1171. The same from California and southward. 



1 172. Wurzite. A form of asphalt from Utah. 



1 173. Ozokerite. Another variety. 



1 174. Elaterite. Another variety, probably from Utah. 



1175. Maltha, Giade C. A variety from Petrola, southern California. 

 1176-1178. Asphalt from Barbadoes. 



1179-1180. Asphalt from Trinidad, West Indies. 



1181. Asphalt from Cuba. 



1 182. Another sample from the West Indies. 



1183-1185. Samples of asphalt from Colombia, South America. 

 1186-1187. Asphalt from Venezuela. 



Turpentines, Tars, and Pitches 



Turpentines are oleo-resins obtained as exudations 

 through natural or artificial openings in the barks of various 

 trees, especially those of the Pinaceae, or pine family. 

 By properly distilling the turpentine we can obtain from 

 it the volatile oil in its natural state, the resins or resin 

 remaining behind. By the destructive distillation of this 

 resin we can obtain a series of resin-oils. 



