184 Drew, Green and St. John : 



tlioiKjli not alwoys, soluble in one or more volumes of 80 per cent, 

 alcohol. It con.sist'< essentiall ij of pliellaiidrene with ^onie aroma- 

 dendretie and from 2.5 to 10 per ceni. of eucahj idol. 



Tilt leaves coii'tain liffh or no n) ijrficohtri n . 



II. — The Oil of Yellow '' ^\.v\ng\/bQ.Y*k'^ ( Eticabjpfn.? Marlhriana). 



As it had been suggested that the Yertcliuk trees described in 

 the preceding section were forms of the yellow stringybark, it 

 seemed desirable to make a direct comparison of their oils. 



The oil of E. Mueller iana has not been described by Baker and 

 Smith, nor does this species grow nearer to Melbourne than Southern 

 Gippsland ; but, by the courtesy of Mr. H. Mackay, Conservator of 

 Forests, who has had a supply of the foliage collected for us at 

 Yarram, we have been enabled to distil and examine the oil from 

 the leaves of two trees, one mature and the other a sapling. 



The oils from these two ti"ees were almost identical excejJt for 

 an insignihcant difference in colour (a brilliant greenish blue), 

 although the yield from the mature foliage was twice as great a? 

 from the sapling. 



This identity is a striking confirmation of the reliability of the 

 composition of the oil as a specific characteristic. 



The table of physical properties of these two samples and of other 

 oils obtained from the ordinary or red stringybark [E. macror- 

 liijnrlia)^ still further illustrates this consistency. 



TABLE 111. 



Physical Constants uf .Stkinuvbauk Uil!s. 



E. Mueller iana — 



... , I'liceiitiiyt Soluijilitv .Spfi-ilif Optical liufi-iictive 



Locality. Date. ^.j^^,,, in akolio'l. .^■ravit.v. rotiitioii. imlt-x. 



Sapling - Yarram - Nov., U»ll - 0.40 - insolul)k' - U.«S7 - -H'O" - l.il^^o 



in HO p.c. 

 Mature - „ - „ - 0.80 - - O.HM - -fL'L'" - 1.4-7;<N 



E. niacrorhyncha — 



Mature - Elthaiii - Oct., lUll - 0.1 1 - - "'.!t2;J - - ti.r/ - 



■ Feb.. l'J12 - 0.11 - - o.'.in. - ±0 - l.nti'M 



- N.S.W. - * - 0.27 -sohililcin- o.'Jl'U - ±(f - 1.48U2 



V\ vols. 70% 

 * A\crage rtsults yiveii by Baker and Smith. 



1. Ill the case of K. laacrorliynrlui oils, the smalt yields ohtuincil have reiidered iiiipos>ilile 

 tlicir s,\ steiu.itic chemical examination and fractional distillation, Imt their physical constants may 

 be compared with the results given by Baker and Sniitli (lUscairb on the Kncidv |it>. y. U7) for 

 trees (frown in .New South Wales. 



