EUCALYPTUS TETRODONTA. 



to the technic requirements of woodmen, who could not be expected to enter on a discrimination of 

 the various sjDecies from such purely scientific differences, on which descriptive botany would rely. 

 Subsequent discoveries of species have not suggested the adoption of any material changes in this 

 first rough grouping according to cortical characteristics for the general guidance of colonists, but 

 the systematic term Pachyphloife, adopted collectively for all the Stringybark-trees, might perhaps 

 give way to the still more expressive designation Inophloice, all Stringybark-trees, as the name 

 implies, producing a very fibrous bark, in which respect they differ materially from the groups of 

 Ehytiphloia3 (comprising many of the so-called "Box-trees") and that of the Schizophloise 

 (including the Ironbark-trees), both these groups having a much more solid bark. As however 

 might be imagined, these distinctions are not absolute ; and when the persistence of the cortical 

 layers on the main branches of any Stringybark-trees becomes imjjerfect, we get a transit to the 

 group of Hemiphloiee, in the leading species of which the branches become smooth from the 

 shedding of the outer and older cortical layers, while the stem remains coated with the complete 

 and gradually very thickened bark. 



