6 inches long, membraneous, on a petiole ol aboul i inch long; venation nol 

 prominent, intramarginal vein removed from the edge, lateral veins oblique, 

 spreading. Flowers verj numerous, up to thirty, on axillary peduncles. Calyx 



i nl) turbinate, or truncate spherical, small, i line long, tapering to a long iilii 



pedicel ; operculum obtuse. 



Fruit. Numerous, small, pilular, on filiform pedi 

 eels ; rim thin, contracted ; \ .il\ es nol 

 i \ ei Mil ; j. rarely .;. lines in diameter. 



.1 fruit with little variation in simp,- ai 

 ■iilar than depicted hire. 



Habitat. On rivei bank- ami mountain ranges oi the coa I 

 district, but preferring banks oi creeks, New South 

 Wall . 



REMARKS. Phis Eucalyptus ha I id a battledore-and-shuttlecock " experienci at the hands oi system; 

 since its naming bi Siebe in Di Candolle's Prodromus," iii,.2i8, [828. Bentham, l;. I I., iii, p. 203 



il r.mk under E. amygdalina, Labill., and Mueller, in " Eucalyptographia," synonymises il alto 

 under that species, t"his action Dr. Woolls strongly opposed for he itates 1 I tora "i Vus1 ralia," p. 239) "No 



one who has had an oppori oi i xamining both trees in a living state would suppose them to be allied a the) 



var) so nun h from eai h other in bark .at I habit," and to this we would add morphological and physical propertii . 

 Next Deane and Maiden also plao I a a \ riety of £. amygdalina, I'm. . Linn. Soc, N.S.W., Vol. 20, p. 603. Maidi a 

 later, howevi 1 synonymises it under /-. amygdalina, " A Critical Rev.," Vol. 1. p. 151, but restores il m spei ifii 



I'm. . Roy. S01 . N.S.W., Vol. 51, p. i'm 1. pla< mil; our E. Australiana a- a synonym. 1 > 1 - Woolls was fa 

 wait tin- tree in the field undei I on nun. .1 " River White Gum." and Bentham reproduces this name (or 



11 under Woolls' authority. Sieber travelled where the" River White Gum" now occurs, and the attempt made to placi 

 /-. A 11 strut 1 una as Sieber' tree i difficult to understand as there is nothing to show that that author ever travelled 

 int.. what was in 1 \; 1 remote and mi. cessible parts ol the Colony, and so the 1 ham es am all in favour that he nevei 

 saw this latter tree, as it is onlj within the lasl few years that the district has been opened up; and besides Siebei 



ptiondoe not match J lustraliana but it does match what has been known and is still recognised as the " River 



Gum" oi Woolls. Sieber's E. radiata is acknowledged in our first edition, and no new data appear to us to 



have been brought to light to warrant out plai ing E. Australiana, which has a Peppermint bark, a-, a synonym fit 



this smooth link tree now Maiden's E. numei >sa. I Proi . Roy s..> \ S.W., Vol. LI). Sieber's E. radiata we 



i 1 White ( aim." 



ESSENTIAL OIL. Leaves ami terminal branchlets tor distillation were 

 obtained from Monga, N.S.W., in September, 1898. The yield of oil was i-88 

 per ct'iit. The crude oil was almost colourless, and had a peppermint odour 

 due to the presence of piperitone. It contained much phellandrene, but pinene 

 was only detected in small amount. Only a very small quantity of cineol was 

 found in the portion distilling at near the boiling point of that constituent. 



A dose agreement i> noticeable between the oil of this species and that 

 1.1 /.. dives, the only apparent differences being that the pinene was more pro 

 nounced in the oil of E. radiata than in that of E. dives, and contained less piperi- 

 tone, consequently the oil commenced to distil at a lower temperature. Esters 

 were not pronounced, and crystallised udesmol was not detected. 



rhe crude oil had specific graviu di 15 ('. = 0-8747; rotation a B - 65-1°; 

 refractive index at 20 = ["4806, and was insoluble in to volumes 80 per cent. 

 alcohol. I he saponification number for the esters and free acid was 4-4. 



On rectification, 2 per cent, distilled below 162° ('. (corr.). Between 

 io_> iN; , 5S per cent, distilled; between [83 204 . _'_' per cent, came over, and 

 between 204 235 . 1 ; per cent, distilled. rhese fractions gave the following 

 results : 



Firsl fraction, sp. gr. at 15 C. = 0-8546; rotation #„ 71-1 . 



Second „ .. „ 0-8677; -- «>■ 5°'5°- 



I lind „ ,, „ = 0-9200 . ,, fl„ - 1-7°. 



