768 president's address. 



uniformity in the flora, but, chiefly because of its vast area, I 

 have endeavoured to break it up, mainly on geological lines. The 

 Murray-Murrumbidgee county is submitted as a fairly well defined 

 botanical area, and the three other divisions are given with the 

 view of ascertaining if they are a guide to the flora upon them. 

 Certainly, as one crosses the Darling from the direction of 

 Bourke, the vegetation is diflferent, and we encounter sand-ridges 

 and salt-lakes, but these are not confined to the Cretaceous, nor 

 indeed to the trans-Darling country, as they are to be found east 

 of the Darling in the Cainozoic country. 



It seems desirable that such an unwieldy area should be 

 broken down into convenient portions, if possible, and, if study 

 of the areas I have suggested shows that they have no practical 

 utility far botanical purposes, it may result in better divisions 

 being indicated. 



Wl. Murray Redgam County. 



This consists of the country enclosed between the rivers 

 Murray and Murrumbidgee, and is bounded on the east by a con- 

 ventional line joining Corowa and Narrandera. It includes the 

 area liable to be flooded, comprising the valuable Murray Red 

 Gum {E^ic. rostrata) flats ; much country similar in character 

 occurs between the Murray and the Murrumbidgee. It has 

 better soil than the other three western counties, and has much 

 less mallee scrub. 



W2. Cainozoic County. 



So called because the area is mainly Cainozoic according to the 

 geological map of the New South Wales Geological Survey. 



The proposed boundaries are : — On the west. South Australia; 

 north, 31st parallel to the Darling River at Myall in the east, 

 thence south-easterly in a conventional line between the Myall 

 and Condobolin, and intersecting the conventional line between 

 Narrandera-Dubbo line referred to ; south, the rivers Murrum- 

 bidgee and Murray. 



In the "key" of the N.S.W. geological map, the Cainozoic 

 area is defined as " Chiefly Pleistocene, with areas of red clay, 



