368 



3. " The next group ... is that which includes all those species whose oils contain phellandrene 

 and the ketone of peppermint taste and colour . . ." 



The species cited are coriacea, Sieberiana, vitrea, dives, radiata, amygdalina, delegatensis, oreades, ard 

 many others (not stated). 



The classification is not stated very clearly in the text, but the explanation of 

 Plate makes it clearer, the figures 1, 2, 3, below corresponding to Nos. 1, 2, 3, above. 



Fig. 1 (E. corymhosa.) We have here " close parallel lateral veins and a thick 

 midrib," indicating the presence of pinene in the oil. 



Fig. 2. (E. Smithii.) " More acute lateral veins which are wider apart. . . 

 The marginal vein is further removed from the edge, and is slightly bending to meet 

 the lateral veins." The authors state these oils consist principally of Eucalyptol and 



Pinene. 



■ 



Fig. 3 (E. radiata.) ' Note the still more acute and fewer lateral veins." The 

 marginal vein is far removed from the edge. Oils consist largely of Phellandrene and 



Peppermint ketone. 



K. R. T. Baker and H. G. Smith, 1902. " A Kesearch on the Eucalypts," 

 especially in regard to their essential oils." (Sydney, 1902). 



This work contains a diagram headed " This diagram showing the probable 

 evolution of the Eucalypts as evidenced by their botanical and chemical characters 

 indicated by this research." It is the first diagram of the kind published in regard to 

 a large number of species, and an attempt is made to show genealogies or affinities in 

 two dimensions, and any criticisms I may have on this most meritorious attempt will 

 be given, in detail, in stating my own results or suggestions. Then follows an ampli- 

 fication of the three Groups of the 1901 paper. 



As the second edition of this work was published in 1920, I shall reserve my 

 comments until that work, which embodies the opinions up to date of the authors is 

 dealt with. See p. 371. 



The illustrations cited by Messrs. Baker and Smith for the most part appeal to 

 New South Welshmen, and the statement is made that pinene was found in Corymbosse 

 oils in Western Australia. This means, as we would expect, a priori, that in oils, as in 

 most other characters, the Corymbosae form one of the most stable and best defined 

 groups of the Eucalypts. 



L. E. C. Andrews, 1913. " The development of the Natural Order Myrtacese," 

 (Proc. Linn. Soc. N.S.W. xxxviii, 529, 1913). 



In working out his thesis the author makes numerous references to the mature 

 leaves of Eucalyptus, and to their venation. The headings of the paper are — 

 Geography ; Earlier forms of Myrtacese ; Home of the earlier forms ; Differentiation of 

 Myrtacese. This valuable paper does not readily lend itself to brief abstract as 

 regards Eucalyptus. 



