204 



if these results are tabulated it can be seen how closely the oils agree in 

 general characters, and, allowing for the slight increase in cineol and less phel- 

 landrene at the time of distillation, with the type E. Risdoni also. 



Suppose;! variety. So called variety, 



data. hypericifdlid. 



Yield of oil ... ... ... ... ... i'2 per cent. 1-24 per cent. 



Rotation a D - 14'! - 14-6 



Specific gravity at 15 C. ... 0-90(11 0-9045 



Refractive index at 20 C 14670 1-4656. 



Cineol by resorcinol ... ... ... ... ... 58 per cent. 56 per cent. 



Saponification number, hot method 21-35 -.! ' s 



Saponification number, cold method 5-5 3-9 



Boiling, between 173-195 ... 93 per cent. B,t. ly^-igS 3 = 94 



per cent. 



Solubility in alcohol ... ... ... ... ... 3 vols., 70 per cent. 5 vols., 70 per cent. 



By the rapid phosphoric acid method the cineol was 46 per cent, when 

 calculated for the crude oil. 



Material of trees growing at Strickland, Tasmania, was obtained in 

 August, 1912. The oil distilled from the leaves of these trees showed 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; rotation a D 9-9; refractive index at 20 = 1-4677; and was soluble 

 in 5 volumes 70 per cent, alcohol. The cineol, determined by the resorcinol 

 method, was 58 per cent, when calculated for the crude oil. The Saponification 

 number by boiling was 21-1 ; and in the cold, with two hours' contact, 6-6. The 

 presence of amyl-acetate in the portion first distilling was also indicated by the 

 pear-like odour, after the aldehydes had been removed, and this was further 

 intensified atter acetylation. 



The results of this later investigation were published by us in the Proc. 

 Roy. Soc., Tasmania, October, 1912. 



106. Eucalyptus linearis. 



(A. Cunn.) 

 White Peppermint. 



Systematic. A fairly tall tree with a clean, smooth, yellow or whitish 

 bark, sometimes rough for a few feet at the base. Abnormal leaves opposite or 

 alternate, linear, about 2 inches long and under 2 lines wide, on slender branchlets 

 covered with tubercles. Normal leaves narrow-lanceolate, under 4 inches long 

 and up to 3 lines wide, thick ; venation scarcely visible, except mid-rib, lateral 



