1 15 



better than the oil of E. globulus, as the yield of oil is greater. It would be 

 necessary, however, to rectify the oil before use, because the esters and volatile 

 aldehydes are present in some quantity ; but this remark applies to most of the 

 richer cineol oils. 



The above samples were mixed together and stored in the dark. In 

 August, 1919, the oil was again analysed. It had not altered much in general 

 characters. Ninety per cent, distilled below 190 C. The crude oil and the 

 rectified portion gave the following results : 



Crude oil, sp. gr. at 15 C. = 0-9264; rotation a u + 6-7; refractive index 



at 20 - 1-4646. 

 Rectified portion ,, 0-9171; rotation D + 7-0; refractive index 



at 20 = 1-4610. 



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

 and calculated for the crude oil ; the result was 77 per cent. By the rapid 

 phosphoric acid method (duplicate determinations) the result was 62 per cent, 

 when calculated for the crude oil. Terpineol was detected in the rectified portion. 

 After acetylation the saponification number was only 21, thus showing that bodies 

 other than cineol and alcohols were absorbed by the resorcinol. 



59. Eucalyptus RodwayL 



(R.T.B. & H.G.S., Roy. Soc., Tas., 1912, p. 191, t. II.) 

 Apple-Scented or Black Gum. 



Systematic. A large forest tree ; often 4 feet in diameter. Bark persistent 

 on stem and branches. Abnormal leaves alternate, oval lanceolate to ovate 

 lanceolate, 3 inches long and about inch broad, inclined to falcate, petiolate, 

 almost membraneous; venation not pronounced, lateral veins distinctly oblique 

 at the base and less so towards the apex. Normal leaves lanceolate, some- 

 times falcate, up to 6 inches long, but usually under 4 inches, and \ inch wide, 

 thicker than abnormal leaves; venation not prominent, intramarginal vein 

 slightly removed from the edge. Peduncles axillary or lateral, about 3 lines 

 long, usually bearing under six flowers. Calyx tube about 2 lines, shortly 

 pedicellate,- operculum conical, acuminate. 



Fruit. Conical or hemispherical, to slightly 

 pyriform ; rim convex, sometimes cracked 

 transversely ; valves slightly exserted ; 

 under 2 lines long and 2 lines in diameter. 



These so resemble those of E. Macarthuri and E. 

 aggregata that witliaut taking into account other 

 physical characters all these species may easily be 

 confounded. 



Habitat. Deloraine (Maiden and Cambage). Between Inter- 

 laken and Tunbfidge, at an elevation of 3,000 feet 

 and down the western slopes to quite a low 

 altitude; also Strickland, Tasmania (L. G. Irby). 



