10. Eucalyptus dumosa, A. Cunn. (Schau. in Walp. Rep., 



ii., p. 925, 1843). 

 "Red Mallee." 



We are in favour of keeping this species distinct from 

 E. incrassata at present, in opposition to Mueller ("Eucalyto- 

 graphaia," Dec. V.), where it is synonymized under that 

 species, while Maiden ("Grit. Rev. Gen. Euc," vol. i., p. 95) 

 only gives it varietal rank to E . incrassata. The specimens 

 received by us from various parts of South Australia are 

 morphologically identical with many others received from 

 New South Wales and Victoria, thus showing a uniformity 

 over a large geographical area of the mainland, which, we 

 think, warrants its specification. 



It is botanically and chemically described in our work 

 on "Eucalypts and Essential Oils," p. 117. 



The material for botanical investigation for this paper 

 was obtained from Kangaroo Island, and the fruits differ 

 only slightly from those of the mainland, being inclined to 

 pear shape and a little longer than the mainland E. dumosa. 



The chemical results show a little variation, but not 

 anything nearly sufficient to warrant the making of even a new 

 variety. 



Essential Oil. 



Leaves and terminal branchlets of this species for distil- 

 lation were collected at the Kingscote eud of Kangaroo Island 

 in the month of June. The leaves of this species were some- 

 what thick, and the terminal branchlets had quite angular 

 stems, the bark on the branchlets being quite red in places. 

 The leaves, after steam distillation, had become quite red in 

 colour, particularly the young shoots at the end of the 

 branchlets. This peculiar red colour, given to the steam- 

 distilled leaves, was also observed with those of E. leucoxylon, 

 but not with the leaves of the "White Mallee" or of any 

 other species from Kangaroo Island. 



The average yield of oil was 0'96 per cent. The crude 

 oil was reddish in colour and in odour resembled the oils of the 

 pinene-cineol group. Cineol was present in fair quantity, but 

 phellandrene was absent. The terpene of low-boiling point 

 was dextrorotatory pinene, and the high-boiling fraction con- 

 sisted principally of the sesquiterpene. 



The crude oil had specific gravity at 15°=0'9041; rota- 

 tion a D+16'4; refractive index at 20° = 1*4667, and required 

 one volume of 80 per cent, alcohol to form a clear solution. 

 The saponification number for the esters and free acids 

 was 3' 7. 



