are conveyed westward to the low-lands, are always flooded in times of great rains in those mountains and on the coast; secondly, that the winter, that is to say, the period between March and August, is the time when the rains are most to be expected, and have most generally fallen on the east coast, and which so falling would naturally cause a flood in the streams above mentioned; thirdly, that in the summer season, or from September to February, which is certainly the driest period of the year, the rains fall westward of the Blue Mountains; but falling upon flat sandy land without any watercourses, do not in the smallest degree add to the waters of the Lachlan or Macquarie, which are then consequently in a state nearly if not entirely stagnant.  It is at this season, therefore, that these streams are visited by the natives, as they are then enabled to procure the shell and other fish which abound in them.  The tracks and impressions made by the feet of the natives were certainly made when the ground was very soft and marshy, whilst their guneahs were merely the branches of trees, and erected in places which we found to be swamps, but which in summer would, in comparison with the plains, be dry ground, the waters from them being drained off into the river.

The Blue Mountain range is by far the highest in New South Wales; the ranges westerly, though high when viewed from the low grounds from which they rise, cannot in any respect be compared with them.

In the summer, the north-east and south-east winds coming from the sea are forced over these mountains, and the vapours with which they are charged are attracted by the lower ranges westerly, and converted into rain.  In the winter, the prevailing winds on the coast and inland, as is evident from the trees on the tops of the hills, are from south-west to north-west.  In the winter, these westerly winds blowing over a vast extent of country, and coming with great violence on the Blue Mountains, confine those clouds and vapours which would occasion rain, to the vicinity of the coast, and the eastern side of the mountains.  A wet summer on the east coast would occasion a flood in the Lachlan at that season; and should the rains then be attended with easterly winds, causing rain on the western side also, the whole low country must be under water for a double reason.  This is a circumstance which, I think, could seldom happen, otherwise the consequence to the miserable natives must be dreadful.

It may be remembered that for nearly two years (viz. 1814 and 1815), scarcely a drop of rain fell on the east coast of New South Wales; and when the country about Bathurst was first visited, it bore marks of being similarly affected by drought.  The last summer was a very wet one on the east coast; at the depot on the Lachlan, during that period when the rains were heaviest (in February), the people enjoyed the finest weather, at the same time the river was constantly flooded, sometimes rising to a great height in the most sudden manner.