389 



in the same way ; it was also less hard and brittle. The weight of the thus dried 

 resin was 248 grams, equal to 62 per cent, of the 400 grams of oleo-resin taken, 

 It was entirely soluble in 80 per cent, alcohol, was very soluble in acetone, but 

 only partly so in ether. 



A solution of i gram resin in 10 c.c. acetone in loo-mm. tube was dextro- 

 rotatory ^D + 3-4°. (This rotation is in the opposite direction to that of the similarly 

 obtained resin of Araucaria Cunninghamii .) 



The specific gravity of the resin was 1-053 S-t 17° C. The acid number was 

 148, and as the formula of the most abundant resin acid was determined as 

 QgHosOs, this result would indicate that about 80 per cent, of this resin acid 

 was present. 



For the analysis, 25 grams of the resin were treated with ether, but the 

 whole of the resin was not soluble. This insoluble portion was treated with fresh 

 ether until all the soluble resin had been removed; and when dried it weighed 

 2-6 grams, equal to 10-4 per cent, of the whole. It was then dissolved in alcohol, 

 filtered, and excess of solid potash added. The pasty, insoluble resin salt which thus 

 formed, was washed with alcohol, dissolved in water, the acid precipitated with 

 excess of hydrochloric acid, and well boiled. The resin was filtered off, washed, 

 dried on porous plate, and heated to 100-105° C. It then weighed 2-5 grams, 

 showing that this resin was almost entirely precipitated by excess of alcoholic 

 potash. This resin acid melted at 234° C, and 0-1547 gram required 4-6 c.c. 

 decinormal NaOH solution to neutralise it, so that 40 grams would neutralise 336 

 grams of acid. The silver salt was readily prepared from the soda salt on adding 

 silver nitrate solution, and if the precipitate was well washed the dried salt was but 

 slightly coloured. It was heated to 100-105° C, when 0-1616 gram of the 

 silver salt gave 0-0394 gram silver, equal to 24-38 per cent. 



The ether, containing the resins in solution, was neutralised with alcoholic 

 potash, using phenolphthalein as indicator; when neutral, water was added, the 

 liquid then becoming quite clear. It was placed in a separator, when the ether 

 readily formed a distinct layer, and the aqueous solution was repeatedly agitated 

 with fresh ether until all the unfixed bodies were removed. The aqueous portion was 

 then boiled to remove all the ether and alcohol, water added, and the whole acidified 

 with hydrochloric acid and boiled. The separated resin melted in the boiling 

 water, forming, when cold, a yellowish lump of resin. It was then powdered, 

 dissolved in alcohol, and solid potash added, a portion was rendered insoluble 

 at once, and this eventually formed a pasty mass, more quickly on gently warming, 

 from which the alcoholic solution was readily removed. This insoluble salt 

 was washed with alcohol, dissoh^ed in water, acidified with hydrochloric acid, 

 and boiled. When dry it weighed 1-5 grams, equal to 6 per cent, of the whole 

 resin taken. It melted at 233° C, and the results of titration, together with the 



