When burned, 47-3 per cent, is removed, leaving 52'7 percent, 

 of impurity, chieily sand. Under the microscope is is interesting 

 to observe that particles have become very much abraded on the 

 edges, confirmatory, of course, of tlie sand having been wind- 

 blown. 



For further particulars in regard to Xanthorrhma-resins, see 

 my paper on " Grass-tree Gum," Proe. Linn. Soc, N.S.W. [2]. 

 V. 4.30 (1890), which includes some notes on the resin of the 

 species under present reference. 



I desire to acknowledge the valuable assistance I have re- 

 ceived from my laboratory assistant, Mr. Henry G. Smith, in the 

 examination of these exudations. 



