184 R. T. BAKER AND H. G. SMITH. 



ance it more closely resembled the oil of Darwinia fasci- 

 cularis than that of D. taxifolia, and the study of the 

 chemistry of the oil indicates its intermediate position 

 between those two species. The crude oil had 



Specific gravity at 15° O. = 0*9150 



Optical rotation a D = + 23*1° 



Refractive index at 20° 0. = 1*4773 



Scarcely soluble in 10 volumes 80 per cent, alcohol. 

 Determination of ester with alcoholic potash. 



(a) Heated to boiling on water bath for half an hour, 



1'5345 gram required 0*154 gram KOH .*. S.N. = 100*4 



(b) In cold with two and three-quarter hours contact, 



1*5340 gram required 0*1484 gram KOH.'. S.N. = 96*7 

 equal to 33*84 per cent, geranyl-acetate. 



This result shows that the saponification number 3*7 

 represents an ester not saponified in the cold with two and 

 three-quarter hours contact, and as butyric acid was 

 detected during the determination of the fatty acids, it 

 is possible that this ester is a butyrate. 



Determination of the fatty acids. 

 Sulphuric acid was added to the aqueous portion after 

 saponification, which was then distilled until all the volatile 

 acids had come over. The perfectly clear distillate was 

 exactly neutralised with barium hydrate solution, evapor- 

 ated to dryness and heated in air bath at 100 - 105° O. 

 The sulphate was prepared from a weighed portion in the 

 usual way; 0*2716 gram of the barium salt gave 0*2446 gram 

 BaS0 4 = 90*07 per cent. 



The odour of butyric acid was distinctly marked, and, 

 assuming the two combined acids to be acetic and butyric, 

 the results show the barium salt to contain 92*15 per cent, 

 barium acetate, and 7*85 per cent, barium butyrate. The 

 separated oil after saponification had a distinct odour of 

 goraniol. 



