293 ETJCALYPTS OF THE COUNTY OF CUMBERLAND, 



should they be proved to result from local causes, as that learned 

 writer suggests, many of the so-called species of Eucalypts will 

 be regarded as mere varieties. As it would be premature to enter 

 upon this question, until a patient investigation of all the known 

 species has demonstrated the value of Mr. Bentham's artificial 

 system, I propose to group the species of the County of Cumber- 

 land according to the cortical system of the Baron, and then to 

 treat of them individually. 



(1.) LeiopTiloicd^ such as have the bark smooth on every side, 

 after the shedding of the outer layer, including the trees commonly 

 called Plooded Gum-trees, White Grum-trees, or Grum-trees in 

 general. This section is well-defined and comprises about a third 

 of the Eucalypts in the County of Cumberland. 



(2.) iLemi^hloice, such as have the bark in the lower part of 

 the trunk, persistent, wrinkled, and full of clefts, in the upper 

 part and in the branches, rendered smooth by the shedding of the 

 outward layer. The common Box and Black-butt may be regarded 

 as typical of this section, but, as it will be seen in the process of 

 inquiry, some species pass from the HemipJiloice to t\ie LeiopJiloiw 

 as they advance in age. 



(3.) BhytiphloicB, such as have the bark everywhere persistent 

 wrinkled, full of clefts, and solid within, as the trees called 

 Mahogany and Bloodwood, including some of the largest trees 

 in the neigbourhood of Sydney. 



(4). PachyphloidB, such as have the bark for the most part 

 persistent, wrinkled, and fibrous within. Of this section, the 

 Stringy Bark is the type. 



(5.) ScJiizophloice, such as have the bark everywhere persistent, 

 deeply furrowed, and solid within. This section comprises all 

 the Iron Barks. 



According to this system, the species of the County of 

 Cumberland will stand in the following order : — 



