54 THE TEANSVERSE SECTIONS OF PETIOLES OF EUCALYPTS 



B. Leaves unequally green on both sides — 



1, Cortical Cavities large — 



a. Hard Bast well-developed — 



A. Wood-curve exceedingly thickened — 



25. E. gomphocephala. 



B, Wood-curve slender — 



26. E. marginata. 



b. Hard Bast feebly developed — 



A, Vessels moderately large and numerous — 



27. E. saligna. 



B. Vessels small and few — 



28. E. punctata. 



2, Cortical Cavities small — 



«, Comparatively numerous — 



29. E. cprynocalyx. 

 6. Relatively few and very small — 



30. E. diversicolor. 



VIII. Species Compared and Contrasted. 



Before instituting comparisons between different species, it seemed advisable to 

 give the characters for all the species as derived from the transverse sections, and 

 then one was in a position to say where resemblances might be traced. Of course it 

 must be borne in mind that out of 134 recorded species, only 30 different kinds are 

 here considered, so that the range is rather limited for making perfectly just 

 comparisons ; still, as far as it goes, it will be useful to take a comparative view, at 

 least for some of the species. 



In the " Eucalyptographia," the affinity between certain species (and even 

 probable identity) is often pointed out, and we will now select some of the more 

 important of these, in order to see how far we agree with, and wherein we differ from, 

 Baron von Mueller, in his views of affinity, views which are based upon other 

 characters, and are the result of prolonged, and careful, and exhaustive study of this 

 special group. It will facilitate this comparison if we give a brief abstract of the 

 allied species. In the following table (III.) the principal affinities are classified, and 

 short reference is made to each : — 



