PLATE XLII. 







"1 he dry country habitat of this species is indicated by the large number ol oil 

 glands seen in the two cross sections of the leaves. In this case nature has 

 evidently responded to the physical conditions obtaining in the home oi this 

 Eucalyptus, and being so provided can by the volatilisation of the essential 

 oil surround itself during excessive heat by a perfume medium ; and, by warding 

 off the solar heat rays, reduce transpiration and so live on when other plants 

 less favoured by nature to resist heat, perish. The short red bands in the middle 

 of the sections show the large number of vascular bundles present (cut more 

 or less obliquely). The sunken stomata are also a feature of this species. x 40. 



EUCALYPTUS COSTATA. R.BR. 



