238 



The Cadia sample was stored in the dark, and in September, 1919, was 

 again analysed. The specific gravity had increased somewhat, as had also the 

 cineol. 78 per cent, distilled below 190 C. The crude oil and the rectified 

 portion gave the following results : 



Crude oil, sp. gr. at 15 C. = 0-9237, rotation not taken; refractive index 



at 20 = 1-4796. 

 Rectified portion ,, =0-9130; rotation a D + 3-5; refractive index 



at 20 = 1-4616. 



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

 and calculated for the crude oil ; the result was 62 per cent. By the rapid phos- 

 phoric acid method it was 50 per cent, when calculated for the crude oil. 



126. Eucalyptus Gunnii. 



(Hook., f., in Lond. Journ. Bot., iii, 499, 1844). 

 Cider Gum. 



Systematic. A small tree with a smooth bark, foliage glaucous when 

 young. Abnormal leaves cordate-ovate or ovate sessile or with petioles varying 

 much 'in length, usually opposite, sometimes emarginate or mucronate. Normal 

 leaves lanceolate, under 3 inches long, acuminate or mucronate, sometimes 

 falcate, older leaves shining; venation not prominent, intramarginal vein well 

 removed from the edge, lateral veins few, spreading, fairly oblique. Peduncles 

 usually axillary, i to 3 lines long, each with three flowers. "Calyx tube turbinate, 

 2 to 3 lines long, almost sessile ; operculum hemispherical, utnbonate, much shorter 

 than the tube. 



Fruit. Cylindrical-turbinate (Kosciusko), or tur- 

 binate (Tasmania), almost sessile, more 

 or less glaucous ; rim convex or somewhat 

 countersunk; valves slightly exserted in 

 Tasmanian specimen ; 3 to 4 lines long, 

 3 lines in diameter. 



The Tasmanian form is perhaps nearest in shape to 

 E. acervula, E. paludosa and E. camphora, but 

 larger. The Kosciusko form has its nearest counter* 

 part in E. Irbyi. 



Habitat. High elevations in New South Wales ; Victoria ; 

 Tasmania, 



REMARKS. Hookers description of this species in his " Flora Tasmania?, " under the common name of 



Cider Gum, and his original in the London Journal of Botany, 1844, iii, p. 499, seems to express definitely what 



species of Eucalyptus he had discovered in that Island. However, very much has been written about it in the last 



lew years, especially by Deane and Maiden, and later by Maiden alone, in various scientific publications. Maiden 



>s in Proc. Linn. Soc., N.S.W., 1902, vol. 26. a long synonymy. Later he describes it in Crit. Rev., vol. iii, p. 



lob. Vve deal fully with the history of the species in our paper on the Eucalypts and their Essential Oils, Roy. 



.pc. J as 1912, from which the following short remarks are taken. The name of E. Gunnii was bestowed by 



looker on what is known as the " Cider Tree " of Tasmania, as shown by his own writings and repeated by 



im, Mueller, Rod way, and others ; and this point should be borne in mind when writing on the species, 



