BY R. U. CAMBAGE. 581 



regulating influence, especially soda, which occurs in varying 

 quantities in both acid and basic rocks; and the whole question 

 provides a most interesting subject for investigation. The 

 presence of free silica affects the physical condition of the soil, 

 and gives it capillary properties; consequently the physical char- 

 acters may sometimes be more important than the chemical con- 

 stituents. South of the latitude of Sydney, E. crebra is not 

 usually found at elevations exceeding 2,000 feet, though, near 

 Colong, some trees are growing at an altitude of about 2,500 feet. 

 This is somewhat remarkable, as the locality is towards the 

 southern limits of the species, which avoids the cold regions, as 

 in fact do all the true Ironbark-group, and does not occur in 

 either Victoria or Tasmania. 



E. tereticornis, Forest Red Gum, was not seen beyond 

 Colong, the elevation being too great. It prefers the quartz- 

 fclsite in this district, and usually shuns the more acid rocks. 

 This is a species which avoids the colder parts of the Moun- 

 tain-Area, and is also absent from Tasmania. 



Leucojjorion hiflorus was fovmd at Mount Werong, as a 

 little, straggling, rather prickly shrub. It closely resembles 

 L. setif/er, and each commonly has two, small, pendulous 

 flowers on axillary peduncles, the distinctive difference being 

 that the peduncle of the former is very short, while that of 

 the latter is usually about three lines long. 



L . Frascrl occurs on the Silurian Slate beyond Bindook 

 Swamp (2,800 feet), and on granite at Mount Werong (3,900 

 feet). It is a prostrate plant, somewhat resembling L. vir- 

 gutus. L. Fraseri is recorded from Victoria, Tasmania, and 

 New Zealand(B.ri. vol.iv., p.218j. 



The absence was remarked of certain well-known Persoonias 

 which are common on the Blue Mountains, nothing being 

 noticed of 1\ mollis or 1'. inyrtilloides. 



Only one species of Grevillea, G. lauri folia, was noticed 

 beyond Colong, and this had the same prostrate, rambling 

 habit usually adopted by this plant on the Blue Mountains. 



