298 



It is thus seen that the characteristic features of the one oil are also shown 

 with the other, and as the botanical material was quite in agreement it is 

 evident that this species is common to both Tasmania and Eastern Australia. 



Material of the " Gum-topped Stringybark " for distillation, was collected 

 at Strickland, Tasmania, in August, 1912. The oil was found to agree in all 

 respects with those recorded above. It contained the same constituents, practi- 

 cally in the same amounts, and the physical characters of the oils agree most 

 closely. The specific gravity at 15 = 0-8596; rotation a n - - 47-4; refractive 

 index at 20 = 1-4812, and was insoluble in 10 volumes 80 per cent, alcohol. 

 The saponification number of esters and free acid was 3-2. The yield of oil was 

 1-3 per cent., which is somewhat less than is usual with this species ; but the time 

 of the year probably accounts for this. 



Material of the "Gum-topped Stringybark," growing at Lake Sorell, 

 Tasmania, was sent for distillation in August, 1912. The trees were those origi- 

 nally mentioned by Mr. Stephens as growing at this locality. These trees are 

 undoubtedly Eucalyptus Delegatensis, and the oil agreed with those from the " Gum- 

 topped Stringybark," growing at Strickland, and Mt. Wellington, in Tasmania, 

 and from the New South Wales trees of this species. The same constituents were 

 present and in practically the same proportions, while the physical characters 

 agree most closely. The specific gravity of the crude oil at 15 C. = 0-8676; 

 rotation D -- 47-7; refractive index at 20 = 1-4819, and was insoluble in 10 

 volumes 80 per cent, alcohol. The comparative constancy in the characters of 

 the oil of this Eucalyptus species is thus conclusively shown. 



The results obtained with the Tasmanian material were published by us 

 in the Proc. Roy. Soc., Tasmania, October, 1912. 



The sample from Delegate Mountain was stored in the dark, and in November, 

 1919, was again analysed. Very little alteration had taken place during the twenty 

 years the oil had been kept, except that the specific gravity had increased some- 

 what, and the optical rotation diminished about 27 degrees. This diminution 

 in rotation is not wholly due to the phellandrene, because the loss on the rectified 

 portion was only 10 degrees. It is evident that the alteration of the piperitone 

 is largely responsible for the less rotation. 64 per cent, distilled below 190 C. 

 The crude oil and the rectified portion gave the following results : 



Crude oil, sp. gr. at 15 C. = 0-8972; rotation a - 30-8; refractive index 



at 20 = 1-4883. 

 Rectified portion ,, =0-8567; rotation D -- 54-3; refractive index 



at 20 = 1-4777. 



The cineol was determined by the resorcinol method in the rectified portion ; 

 when calculated for the crude oil, the result was 3 per cent, of that constituent. 



