AND THEIR ESSENTIAL OILS. 45 



The rectified oil was yellowish in tint, resembling in 

 this respect the oil of E . globulus, K. goniocalyx, &c. 



The amount of eucalyptol in the crude oil was 50 per 

 cent., determined by the resorcinol method in the portion 

 boiling below 194 C. The saponification number of the 

 esters and free acid was 9'5, which represents about 3 per 

 cent, of ester calculated as geranyl-acetate. 



Material of the "White Gum" growing at Tnterlaken 

 was sent for distillation in August, 1912. The leaves and 

 terminal branchlets were, at this time, largely attacked 

 with a blight, and the trees were thus not healthy. The 

 yield of oil was less in amount than that from the Hobart 

 material, otherwise it agreed generally in characters and 

 constituents with the oil of this species. The phellan- 

 drene, however, was present in rather larger amount than 

 usual, and the eucalyptol somewhat less abundant. There 

 was a very strong resemblance between this oil and that 

 of E. viminalis from Moss Vale, New South Wales, 

 recorded in the " Research on the Eucalypts " (p. 138). 



EUCALYPTUS DELEGATENSIS, R. T. B. 



[SYN. : E. gigantea, Hook. f. (" Fl. Tas."), partim. 



Not E. gigantea, Hook. f. (" Lond. Journ. Bot." 

 VI. 479. 1847). See remarks under E. 

 obliqua and E '. regnans, this paper.] 

 f" Gum-topped Stringy-bark." ) 

 BOTANY. 



Historical. This tree was first collected in Tasmania 

 by Gunn (infra), but was first brought under the notice 

 of Australian botanists by Mr. T. Stephens, who forwarded 

 a specimen to Baron von Mueller, who named it for nina 

 E. haemastoma, Sm. ; and this was recorded in Proc. Roy 

 Soc. Tas. 1881 (p. 24). Under that species Mr. Maiden 

 goes pretty fully into the subject of the " Gum-topped 

 Stringy-barks " of Tasmania in the Proc. A.A.A.S. 1905 

 (p. 369 onward); also in his " Cr. Rev. Euc." or 

 E. obliqua (Pt. 2), and again in the Viet. Nat. XVIIL 

 (p. 127). The species recorded by him (loc. cit.) undei 

 E. virgata is this species. This particular " Gum-toppec 

 Stringy-bark " was, however, given specific rank undei 

 the name of E. Delegatensis, R. T. B. (Proc. Linn. Soc 

 N.S.W. 1900), from material obtained from Mt. Delegate 

 N.S.W., its Tasmanian habitat at the time not being 

 known to the author. 



