UNDESCRIBED SPECIES OF LEPTOSPERMUM. 129 



constituents were also removed from a larger quantity of 

 oil prepared for the other determinations, and the separated 

 oil carefully collected and • weighed ; 40 grams of oil gave 

 25*9 grams of non-aldehydic constituents, equal to 35*25°/° 

 of aldehydes. The barium salt of the aldehydic bisulphite 

 compound was prepared, and the aldehyde when separated 

 from the filtrate by the addition of soda, extracted by ether 

 and steam distilled, was shown to be citral. Its odour 

 indicated that aldehyde, its specific gravity at 21° 0. was 

 0*8929 and it had a refractive index 1*4913 at 20° O., it was 

 also inactive to light, and the naphthocinchoninic acid, 

 prepared by Doebner's reaction, melted at 199° O. The 

 very small amount of aldehyde (about one per cent.) 

 obtained from the barium precipitate in the usual way, 

 gave no indication for citronellal, but consisted apparently 

 of partly polymerised citral as indicated by the odour and 

 by the refractive index. 



The citral prepared from the crystalline bisulphite com- 

 pound by purif ying the crystals with ether-alcohol, decom- 

 posing with sodium carbonate and steam distilling, gave at 

 20° C. a refractive index 1*4913 and specific gravity 0*8937, 

 indicating that citral is the only aldehyde present. 



The non-aldehydic portion of the oil had a specific gravity 

 0*8866 at 20° O.; rotation + 13*4°; refractive index 1*4855 

 at 22° O. The index of the original oil determined at the 

 same time and under identical conditions was 1*4873, so 

 that the index of the aldehyde was higher than that figure. 

 The ester determination was made on the non-aldehydic 

 portion of the oil, the saponification number was 23*5 equal, 

 to 8*225f° of ester as geranyl-acetate. The aldehyde being 

 35f, this gives 5*346°f of ester in the original oil. A deter- 

 mination for ester in the crude oil gave 5*54°/ e . A portion 

 of the non-aldehydic oil was esterised in the usual way, 

 and this gave a saponification number 73*63, which repre- 



I— Dec. 6, 1905. 



