Geographical Distribution. 



THE scheme of evolution of the Eucalypts formulated in the following article is 

 further supported by following out the geographical distribution of the species. 



Thus on the assumption that those Eucalypts known as the " Bloodwoods " 

 and their affinities are the oldest group of these trees, and that Western Australia 

 is the oldest portion of the continent, one would naturally expect to find them 

 well represented in that part of the continent, and such is the case. The 

 ' Bloodwoods," and red-timbered Eucalypts especially, are the distinguishing 

 features of the forest trees belonging to the Genus in Western and North-western 

 Australia, and trees with these characters extend through the Northern Territory 

 down Eastern Queensland, and Eastern New South Wales, discontinuing in 

 the north-east corner of Victoria, there being no representative of this group in 

 Tasmania, where only pale coloured timbers occur. 



The closely allied Genus A ngophora accompanies the red-timbered Eucalypts 

 in Queensland, down through New South Wales, finishing with one species, 

 Angophora intermedia, on the Grampians, in Victoria. No Angophora species 

 has been recorded from Tasmania, and no red wood Eucalyptus, either, for the 

 matter of that a pale timber feature that extends well into Victoria. Pale- 

 coloured timbers also extend north, far into New South Wales. In this latter 

 State we find in addition to the red woods, the groups of "Peppermints," 

 " Stringybarks," and " Gums," gradually increase in number and importance 

 as one travels south to Victoria, until in Tasmania they are the only represen- 

 tatives of the genus the red woods and " Bloodwoods" being quite absent. 



Branching off at different intervals from the main line of species are the 

 ' Ironbarks," " Gums," ' Boxes," ' Malices," " Stringybarks," and " Pepper- 

 mints." The " Ironbarks " are an interesting group, and evidently are closely 

 connected with the members which yield oils richest in cineol. 



Not only do we thus find an evolutionary agreement with the geologv 

 and botany, but this is further confirmed by the chemistry, for according to the 

 above reasoning the more recent of the species shown at the end of our table, 

 are found to yield phellandrene-bcaring oils, while with the most ancient species 

 occurring at the beginning of the table the terpene is pinene. 



Thus applying the table of evolution to a contour map of Australia in 

 the order of geological age, the head or primary species (the red woods) are found 

 in the western portion of the continent, and then travelling north and south, 

 complete the range with the pale-coloured timbers in Tasmania and Southern 

 Victoria. 



