Everything relating to the progress of geology in our Colonies is, or ought to be, of interest to geologists at home; and those who have helped forward this movement are also deserving of recognition and commendation here. The subject of the present notice has left his hammer-marks on the rocks of Western Australia, and has covered many thousand miles on horseback, on foot, by rail and steamboat, from north to south and from east to west of this great region, containing an estimated area of 976,000 square miles, being about nine times that of the United Kingdom, and covering about one-third of the whole Australian Continent.