— 26 — 



the solution in acetic acid was diluted with sulphuric acid. So far it has 

 not been possible [to ascertain the constitution of callitrol. The solid 

 portion mentioned above crystallises from alcohol in hexagonal prisms, 

 melts at 91° and, as shown by a combustion, consisted of guajol, 

 Ci 5 H 26 0; [«] — 29° (in 5% alcoholic solution). Guajol is also present in 

 the oil from the wood of Callitris Macleyana (stringy bark pine), of which 

 a yield of 0,558% oil, forming a semi-solid deep red liquid, was obtained. 

 It likewise occurs in the oil from Callitris intratropica to such an extent 

 that guajol crystals frequently appear upon the surface of the newly-cut 

 wood. The same phenomenon may be observed in the wood of other 

 species of Callitris. The oil from the wood of Callitris intratropica also 

 contains callitrol. 



Several species of Callitris also yield a resin possessing properties 

 resembling those of African sandarach (from Callitris quadrivalvis) ) but as 

 no rational method of collecting the resin is yet known, it is not re- 

 munerative to gather it at the prices now ruling. 



In the subjoined remarks on the particular oils it should be borne in 

 mind that the Callitris-specles are subdivided into groups of which the 

 botanical attributes agree with the presence in them of d-limonene, 

 1-limonene and pinene. 



Oil of Callitris robusta, R. Br. (Syn.: C. Preissii, Miq.; C. Suissii, 

 Preiss; Frenela robusta, A. Cunn). The leaves of this species, which occurs 

 in Western Australia, when distilled in June, yielded 0,261% of an oil 

 possessing the following properties: di 5 o 0,8825, « D + 10,3°, n D19 o 1,4752, 

 sap. v. 49,59=17,35% ester CH 3 COOC 10 H 17 , soluble in 10 vol. of 80% 

 alcohol. After carefully fractionating the oil, the authors isolated from it 

 d-a-pinene, d-bornyl acetate, and geranyl acetate. They also surmise the 

 presence in the oil of limonene and dipentene, although, judging from the 

 physical constants of the fraction in question, the proportion of both these 

 bodies is probably slight. It was also ascertained that the oil probably con- 

 tains a sesquiterpene. The pinene-content of the oil was fairly considerable. 



The oil from the fruit, of which a yield of 0,363% was obtained, 

 possessed the following constants: d^ 0,877, « D — 17,9°, n D18 o 1,4774, acid 

 v. 2,6, ester v. 16,8 = 5,88% ester CH 3 COOCi H 17 . 



Oil of Callitris verrucosa, R. Br. {Frenela verrucosa, A. Cunn.). The 

 tree yielding this oil is known as "Cypress" or "Turpentine Pine" and is 

 chiefly found in New South Wales, but it has also been met with in the 

 interior of Australia, and in Western Australia. 



The oil from the leaves (yield in September 0,331%, in December 

 0,266%) has the following constants: d 23 o 0,8591 and 0,8596, « D + 44,2 and 

 74,5°, n D190 and n D20O 1,4809, sap. v. 8,93 and 10,87, ester v. after acet. 21,27, 

 insoluble in 10 vol. of 90% alcohol. 



After careful fractionation the oil was found to contain: d-«-pinene 

 (m. p. of the nitrolbenzylamine 122 to 123°), d- and 1-limonene, and di- 



