1 49 



ESSENTIAL OIL. Leaves and terminal branchlets for distillation wi 

 lined from near Pokolbin, N.S.W'.. in August, [907. rhe yield of oil was 

 [•6 per cenl 



The oil from this species 1- one of the besl ol the cineol pinen i li 

 oi Eucalyptus oils, and compares favourably with those from E. polybra 

 E. Smithii, and others. As i1 grows in the " Mallee " form th< leaves would 

 aol be difficull to collect, and ii occurring in quantity should be profitable foi 

 oil distillation, rhe rectified oil was jlightl} tinged yellow, as are prai ti< ally all 

 the iv. tified oils oi this class. « ineol was the chiei 1 onstituenl . three quai 

 of the oil consisting of thai substance. Pinene was present, bu1 phellandrene 

 was absent. Although the pinene was dextro-rotatory, yel thai form only 

 shghtly predominated, consequently the rotations for the crude and rectified oils 

 almosl the same. The Lower boiling aldehydes, butaldehyde and valeralde- 

 hyde, were pre en1 as is usual with oils of the cineol pinene class. the higher 



boiling portion contained some sesquiterpene, and it is probable thai m: 



dral was also presen in small amount. 



The crude oil had specific gravity at 15 C. = 0-9237; rotation a D + 2-3°; 

 refractive index .'1 20 = [-4683, and was soluble in i-i volumes 70 per cent. 

 alcohol. The saponification number for the esters and free acid was ;•_:. 



On rectification the usual amount of acid water and volatile aldehydes 

 came over below [67 C. (corr.). Between 1(17-183°, 89 per cent, distilled, and 

 between 183 -'5" . 8 per cent, distilled. These fractions gave the following 

 results : — 



First fraction, sp. gr. at 15° C. = 0-9166; rotation a D + 2-2°; refractive 



index at 20 = 1-4668. 

 Second ,, ,, ,, = 0-9359; rotation a B + o-6 ; refractive 



index at 20° = 1-4760. 

 The cineol was determined by the phosphoric acid method ; the result was 

 7 1 per cent, of that constituent in the crude oil. 



79. Eucalyptus pulverulenta. 



(Sims, in Bo1 Mag., t. 2087.) 

 (Syn. E. pulvt 1 1, V I iinn.) 



Systematic. A tall shrub, with a " weak green stem hardhj able to 

 supporl itseli " (Sim . the bark on the thicker stems is smooth, flaking ofl near 

 the base, where only specimens of the wood can be obtained. The Lower parts oi 

 the green stems have the appearance ol rattans oi p. dm- bj the scars left by the 

 base of the old deciduous Leaves, which produce an^effecl somewhal similar to 

 the node- of the bamboo. I" our knowledge no other Eucalypt has this 

 eh;i.r;u t'T. Leaves sessile, ovate, cordate, orbicular or broadl) ovate, obtuse, or 

 very shortlj acuminate, tiol crenulate, or hardly perceptible, yellowish-green and 

 slightly shining, or mealj while, rigid, coriaceous; venation distinct, Lateral 

 veins spreading intramarginal vein removed from the edge. Peduncles axillary, 



