305 



REMARKS. Both I '• ntliaui and Woolls were in accord with Schaucr in regarding tfa 

 es but Mueller synonymised it witl I bill., and tl used the latter specie >i' 1> 



..i its good n i' for m~t.: 



( .ui eithei le, opposite ant! 



, ,.r l [t also Bowers of its growl b 5 to 6 



t) when the peduncles at the base "i th I it from ilina, whilst in 



tins l.m : pulverulenta. The earl) 



also quite diffi 1 I imber, and constituents oi 



oil. It is, therefore, all the more difficult to understand how on morphological 1 two should have b 



thought to b 1 I ree. 



ESSENTIAL OIL. Leaves and terminal branchlets for distillation were 

 obtained from Fagan's Creek, Braidwood, X.S.W., in October, iNg8. I'he 

 yield of oil was i-g6 per cent. I he i rude oil was almost i olourless, and had a 

 strong peppermint odour, due to the large amount oi piperitone ii contained. It 

 consisted very largely oi phellandrene. < ineo did not exceed 5 to 8 per cent, 

 in the crude oil The third fraction consisted largely oi the peppermint ketone, 

 piperitone. 



The crude oil had specific gravity at 15° C. =0-882; rotation a B 63*9°; 

 refractive index at 20 = 1-4837, and was soluble in 2 volumes 80 per cent, 

 alcohol The saponification number for the esters and tree acid was 2-9 



On rectification, 2 per cent, distilled below 172° C. corr. . Between 

 C72-198 , 60 per cent, distilled ; between 198-227°, 13 per cent came over, and 

 between 227 240°, 20 per cent, distilled. These fractions gave the following 

 results : — 



First fraction, sp. gr. at 15° C. = 0-85935 rotation a D - 73-8°. 



Second ,, = 0-8936; ,, not taken. 



Third , = 0-9318; , a D — 9-4°. 



Material oi this species for distillation was also obtained from Barber's 

 Creek, N.S.W., in October, 1:898. The yield of oil was 2-1 percent.; the crude oil 

 differed in no respect from the above sample, and this result is a good illustration 

 of the comparative constancy of constituents in the oil of the same species at the 

 same time of the year. The specific gravity of the crude oil was 0-882, and optical 

 rotation a D - 63-6°. The crude oil formed a clear solution with 1 volume 

 80 per cent, alcohol, and the peppermint ketone, piperitone, was present in great 

 quantity in this sample 



Material of this species for distillation was also obtained from Berrima, 

 N.S.W., in May, 1899. The yield of oil was 2-9 per cent. The specific gravity 

 of the crude oil was 0-8887, and optical rotation t i„ - 55-8°. It was in agree- 

 ment in all respects with those mentioned above, and formed a clear solution with 

 1 volume 80 per cent, alcohol. 



Material of this species was also obtained from Rylstone, X.S.W., in August, 

 1898. The oil was practically identical with the above. 



During recent years, considerable quantities oi the oil of this species have 

 been distilled in Australia. It is the best of all essential oils for use in the Mining 

 Industry for the separation of mineral sulphides by a flotation process, and as 

 the yield is large it can be produced somewhat cheaply. Previously the oil of 

 E. dives was forwarded to Europe as the product of E. amygdalina; that this 

 is so can be seen from the stud\ ol the constants recorded in the older literature. 



The oil oi E. dives shows a comparative constancy similar to those oi 

 other individual Eucalypts, so that the species has now become stabilised. 



This subject is more lulk treated in the article "The comparative con- 

 stancy of the oil prod ui I - 1 1 01 n individual species oi Eucalyptus." 



