38 A RESEARCH ON THE EUCALYPTS OF TASMANIA 



Supposed Variety So-called Variety 

 elata. hypericifolia. 



Yield of oil 1 2 per cent. 1-24 



Rotation a D -14-1 -14-0 



Specific gravity at 15 C. ... 0*9061 0-9045 



Refractive index at 18 1-4679 At 1 9= 1-4660 



Eucalyptol 58 per cent. 56 percent. 



S.N., hot method 21-35 23-8 



S.N., cold method 5-5 3'9 



Boiling, between 173-195... 93 per cent. Bet. 173-198 94/ 



Soluble In 3 vols. 70/ In 5 vols. 70 / 



alcohol alcohol 



Material of trees growing at Strickland, and thought by 

 the collector to be K. radiutu, as the fruits were more 

 clustered than usual, was obtained in August, 1912. The 

 oil distilled from the leaves of these trees shows them to 

 be E. Risdoni also, and it responded to all the tests 

 required for the oil of that species. The yield of oil was 

 1-5 per cent.; specific gravity at 15 C. ---. 0*9079 ; rota- 

 tion a D = - 9*9; refractive index at 15'5 = 1'4698; 

 and was soluble in 5 volumes 70 per cent, alcohol. The 

 eucalyptol, determined by the resorcinol method, was 58 

 per cent, in the crude oil. The saponification number by 

 boiling was 21' 1 ; and in the cold, with two hours' con- 

 tact, 6' 6. The presence of amyl-acetate in the portion 

 first distilling was also indicated by the pear odour, after 

 the aldehydes had been removed, and this odour was fur- 

 ther intensified after acetylation. 



EUCALYPTUS UNIALATA (sp. nov.). 

 [SYN. : E . viminalis, var. nuK-mcai'im.] 

 (Plate I.) 

 BOTANY. 



Historical. Maiden, in the A.A.A.S., 1902, records 

 this Eucalyptus under the name of K. Mauhni, F. v. M., 

 but Rodway, in his " Flora of Tasmania," places it under 

 E. v%minal%9 t var. -mncrocarpa. 



Remarks. It is a particularly rare tree apparently, for 

 after much search by the museum collector, Mr. Irby, only 

 two trees were found, and those on Mt. Nelson. The 

 original tree discovered by Mr. Rodway is at Proctor's- 

 road (Mt. Nelson), 5 miles from Hobart, and is about 

 30 to 40 feet in height, and about 12 inches in diameter. 

 " Bark flaky at the butt, smooth above, very similar *o 

 E. viminalis." Mueller considered it a form of E. glob- 

 ulus, and J. H. Maiden a form of E. Maideni, F. v. M. 



