BY THE REV. DR. "WOOLLS, M.D., F.L.S., ETC. 291 



1. ^.IonpfoUa,(Ijmk&Otto.) 7. U. saligna, (Sm.) 



2. U. robusta, (Sm.) 8. JJ. resinifera, (Sm.) 



3. E. hotryoides, (Sm.) 9. E. corymhosa, (Sm.) 



4. E. viminaUs, (Labill.) 10. E. maculata, (Hook.) 



5. E. tereticoroiis, (Sm.) 11. E. eximia, (Schau.) 



6. E. punctata, (DC.) 



This system o£ grouping the species has its merit in the 

 arrangement of specimens for the herbarium, and also in enabling 

 the observer to identify any species which is remarkable for the 

 shape or opening of its anthers ; but it labours under two defects, 

 viz., that it places in close proximity trees differing materially in 

 bark, wood, and fruit ; and that it sometimes separates widely 

 those species, which, in the minds of the Colonists, must ever be 

 associated with each other. 



The cortical system of Baron Mueller, therefore, is the more 

 natural and practical, and although in individual trees, the bark 

 may differ sometimes from the typical character of the section 

 in which it is placed, yet there is little difficulty in determining, 

 from a comparison of several trees, whether a species should be 

 grouped with the smooth-barked, half -barked, or fully barked 

 kinds. Solitary specimens of the common G-rey Grum (E. 

 tereticornis,) have sometimes been found with fibrous bark on the 

 butt ; and, on the other hand, the Box (E. hemipklora) and the 

 "Woolly Butt (E. longifolia) vary occasionally from the ordinary 

 type in proportion to their age and the nature of the soil. The 

 Blue Grum also (E. saligna) , which, for the most part, has very 

 smooth bark, is found here and there with rough bark on the butt. 



Baron Mueller in taking an extensive view of specimens from 

 all parts of Australia, is disposed to amalgamate species differing 

 very much in the character of the bark, and he refers the aberra- 

 tions from typical form to geological considerations, the elevation 

 above the sea-level, and the range of temperature. The deviations, 

 to which I refer, are in some instances very remarkable, and 



