82 
Lectures on the Geology, Botany, Sfc., of the 
1. The first comprises the scrubby country between Darling 
Downs and Peak Range, with the Dawson and the Mackenzie 
(latitude 27° 23'.) 
2. The Plains of Peak Range, the Isaacks, and the Upper 
Suttor, of which the Isaacks forms the outlet to the sea, between 
23°—20° 50' latitude. 
3. The Lower Suttor, the Burdekin, and its table land 
(21°—18°.) 
4. The Lynd, the Mitchell, and the east coast of the Gulf of 
Carpentaria, between 18°—16° of latitude. 
5. The “ Plains of Promise,’' so called by Captain Stokes, at 
the head of the Gulf, in 18° of latitude, with the Flinders, the 
Albert, and the Nicholson. 
6. The scrubby west coast of the Gulf, with the Van Alphen, 
the Abel Tasman, the Seven Emu River, the Robinson, the Mac- 
arthur, the Limnenbight River, and the Wickham, between 
18°—15°. 
7. The River Roper and Arnheim Land, 15°—13° 40'. 
8. The Alligator River and the Coburg Peninsula (latitude 
13=> 40'—11° 21'.) 
The country between Darling Downs and the Mackenzie, 
between the 27° and 23° of latitude, is eminently characterised by 
the frequency and by the peculiarities of its scrubs. It is prin¬ 
cipally composed of sandstone, which, judging from its coal beds, 
and the impressions of plants contained in it, is identical with the 
sandstone formation of the Lower Hunter. But in several loca¬ 
lities it has been broken by basalt (whinstone,) which forms 
either peaks, as Mount Aldis and Mount Nicholson, or the spine 
of large ranges, as Expedition Range. The sandstone ranges are 
remarkable for the number and steepness of their gullies, and for 
their scrubby vegetation. The basalt is generally connected with 
plains or with very openly timbered and treeless downs, clothed in 
a rich vegetation of herbs and grasses. The country was, with a 
few exceptions, well watered; and almost daily thunder-storms 
cooled the atmosphere during October, November, December, 
and January. But not only the high level land west of Darling 
Downs, which sloped almost imperceptibly to the south-west, but 
