situations in good soil are umbrageous trees ; such, for example, are stellulaat, 

 aggregata, Macarthuri, but this character is largely a matter of environment. 

 Then some species, e.g., viminalis, have a more or less drooping habit as a rule, 

 but this species is often nearly erect in less congenial soil. And further, to show 

 variation in habit, we have only to point to the Eucalyptus plantations of California 

 and the South of Erance, where the species ai*e cultivated almost out of recognition. 



Bark. — Mueller {Joum. Linn. Soc, iii, 99, 185S) arranged the genus in the 

 following six groups in respect to their barks. With the additional information we 

 have obtained since Mueller's paper was published, we are able to recast his list of 

 examples. It will be found, however, that no two botanists agree as to the sections 

 in which to place some of the species, and as further field-knowledge is available 

 and we know more about the variation of the bark in the same species, the same 

 authority modifies his own lists. See Woolls, " On the classification of the 

 Eucalypts" {Proc. Linn. Soc. N.S.JF. (2), vi, 60). 



" i. Leiophloup. — Cortex post delapsurn strati supremi undique laevis. 

 (Vulgo, flooded gum trees, white gum trees, blue gum trees partim, 

 red gum trees partim, yarra trees.)" 



Smooth barks (" gums " we call them). — Examples are — E. hcemastoma, 

 tereticoniis, rostrata, leucoxylon, vlminalis, Gunnii, maculata, latifolia, aspera, 

 stellulaia, coriacea, saligna, Eehriana, punctata, stricta, fasciculosa. 



'•' ii. ILemiphlo'uc . — Cortex in trunci parte inferiore persistens rugosus et 

 rimosus, in parte superiore ramisque delapsu strati superioris 

 latwigatus. (Vulgo, Moreton Bay ash, blackbutted gum tree, box 

 trees partim.)" 



Half barks, the barks of the lower part of the trunk persistent and the 

 upper part smooth. Examples are — E. hemiphloia, pilularis, hicolor, longifolia, 

 rnclliodora, amy (j da Una, dices. The Moreton Bay Ash (tesselaris) is better in 

 section iii or vi. 



" iii. llht/tiphloice.—Covtcx ubique persistens rugosus et rimosus intus 

 solidus. (Vulgo, bloodwood trees, box trees partim, peppermint trees 

 partim.)" 



With wrinkled persistent bark, rather solid. This is an unsatisfactory group, 

 including heterogenous barks. Mueller intended it to include the bloodwoods 

 (cot'ymbosa, eximia, trachyphloia), also hicolor (which is better in ii) and E. micro- 

 theca, leptophleba, ferruginea. Odorata, robusta, botryoides may be added, and 

 also Stuartiana, pulcerulenta, microcorys, acmenioides, resinifera, polyanthema, 

 popnlifolia, piperita. 



Nos. ii and iii run into each other, and both of them into No. iv. 



