426 



time all of the liquid portion had been absorbed. The solid which remained was 

 quite white, and practically without odour. It was dissolved in boiling alcohol, 

 filtered, and allowed to cool, when much of the solid separated. The crystals 

 were not well defined, were inchned to be tabular, and when dried on the slab had 

 a nacreous lustre. It was finally purified, as previously stated, by dissohang in 

 chloroform and precipitating by alcohol. The melting point was 95° C. It was 

 optically active, and three determinations gave results as follows : — 



(1) 0-3398 gram dissolved in 10 c.c. chloroform rotated the rav + o-55° 



in a i-dcm. tube, thus the specific rotation [i']i,= + i6-iS°. 



(2) 0-6268 gram dissolved in 10 c.c. chloroform rotated + i-o° in i-dcm. 



tube, therefore [a]i, = + 15-95°. 



(3) 0-5925 gram dissolved in 10 c.c. benzine rotated 0-95° in i-dcm. tube, 



therefore [«]i, = +16-04°. 



Mean [«]„ = + 16-06°. 



Analyses gave the following, the substance being fused in the boat before 

 weighing : — 



(i) 0-1566 gram gave 0-5067 gram CO.^ and 0-1656 gram HjO. 

 C = 88-244, ^rid H =11-75 per cent. 



(2) 0-1304 gram gave 0-4216 gram CO^ and 0-1376 gram H^O. 



C = 88-11, and H = ii-74 per cent. 



(3) 0-1455 gram gave 0-47 gram CO., and 0-1546 gram H^O. 



C — 88-14, and H = 11-74 per cent. 



C.,yH:,., requires C = 88-24 ^.nd H =11-76 per cent. 



The molecular weight determinations were made with benzene as solvent. 



(i) 0-5988 gram in 21-5 grams benzene reduced the freezing point by 

 0-515°; M\V =264. 



(2) 0-5104 gram in 15-5 grams benzene reduced the freezing point b}'^ 

 0-605°; MW = 267. 



C.3,H3.2 (C = 11-91, H = i-o^ = 270. 



These results show the solid substance in the oil of this tree to be a 

 hydrocarbon, and to have the formula C-oHs^. 



When the crystals were dissolved in cliloroform and shaken with a few 

 drops of sulphuric acid there was no colouration, even after twenty-four hours. 



The reactions with acids, &c., have been referred to in the earher portion 

 of this article. 



