179 



rhe above samples were mixed together, stored m tin- dark, arid in 

 September, 1919, the oil was again analysed, rhe specific gravitj had incre; 

 somewhat during the 20 years it had been kept, and the cineol had also increased 

 in amount, rhis is well shown by the constants obtained with the rectified oil. 

 The crude oil and the rectified portion gave the following results. 84 percent, 

 distilled be! w [90 C. : 



Crude oil, sp. gr. at 15 C. = 0-9518; rotation i c + 4-1) ; refractive 



index at 30 i- \<> > 



Rectified portion ,, ., = 0-9267; rotation a B + 3-0°; refractive 



index a 1 21 1 = 1-4596. 

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

 and calculated for the crude oil; the result was 79 per cent. By the rapid 

 phosphoric acid method it was o(> per cent., when calculated for the (nude oil. 

 Terpineol was detected m the rectified pun urn. 



We have described somewhat fully the various samples of oil obtained 

 from this species, as the localities enumerated cover a large area, and the time 

 extend^ over some years. The results show how closely related are the chemical 

 constituents of the products of a particular species of Eucalyptus, irrespective 

 ot location or environment. 



93. Eucalyptus punctata. 



(DC, Prod., iii, 217.) 

 Grey Gum. 



Systematic. -A large tree, with a dirty looking, smoothish, or friable bark, 

 and rectangular branchlets. Abnormal leaves ovate, lanceolate, often shortly 

 acuminate, 4 to 6 inches long, pale coloured on the underside, sometimes almost 

 oblique, membraneous, margins recurved ; venation distinct, oblique, spreading. 

 Normal leaves lanceolate, sometimes oblique, pale on the underside, varying 

 in length and breadth up to 6 inches and 2 inches respectively, dimly 

 coriaceous; venation not pronounced, lateral veins fine, oblique, parallel, intra- 

 marginal vein close to the edge. Peduncles axillary, flattened, under 6 lines long, 

 about six flowers in the umbel. Calyx in the bud stage angular, conical ; in the 

 flower stage hemispherical; operculum conical or hemispherical, and much 

 acuminate, under 3 lines long. 



Fruit. -Turbinate to hemispherical, pedic< 1 thick, 

 short : rim thick, domed ; valves obtuse. 

 well exserted and pale ; 4 lines in diameter. 



They arc quite specific; the dark slightly Joined rim 

 is the more common and easily distinguished, but 

 occasionally the run is truncate, giving the capsule an 

 E. resinifera appearam c. 



Habitat. Coast districts of New South Wales and Queens- 

 land. 



REMARKS. I in- 1 mi' "i thi be ' known trees in the neighbourh 1 oi Sydney, when i1 



appellation is " Grey Gum Lhe bar] and altho 10th, yet is perhaps the dirtiest 



looking bark to be found ai I o Gum In the older trei itbecomi d rk rugosi variegated, 



andexud tnna (H. G. Smith; • i I ': Proi R03 Soc.; N.S.W., Vol. 31, p. 177), as we}l as tfte leaves. rhe 



rnoui separa ted undei I 1 ' ■ ' ■ 



