The Collection of Western Australian Cephalopoda which has been handed to me for examination consists of twelve specimens, viz. two Belemnites, one Nautilus, and nine Ammonites. One Ammonite was obtained from Cape Riche, E. of Albany; all the other specimens were collected near Champion Bay. They are chiefly internal casts, and ou the whole are badly preserved: the Nautilus is in a fair state of preservation; but the Ammonites are very imperfect; the suture-line can be satisfactorily made outinonly one specimen, hence the generic determinations must be regarded as only approximate.

In the extreme northernmost part of Canada, lying between North Latitudes 56° and 68° and West Longitudes 88° and 112°, is an area of about 400,000 square miles, which had up to the past two years remained geologically unexplored.

In 1892 the Director of the Geological Survey of Canada sent the writer to explore the country north of Churchill River, and south-west of Lake Athabasca;in1893 the exploration was continued northward, along the north shore of Athabasca Lake

Up to the year 1867 the only traces of organisms that had been found in the beds then classed as Cambrian by the Geological Survey (now Lower and part of Middle Cambrian of most authors) were tracks and burrows of Annelids; and the doubtful Trilobite Palæopyge found by Mr. Salterinthe Longmynd rocks of Shropshire.in“Siluria”, fourth edition, 1867, p. 30, Sir R. Murchison refers to them as follows: “These, then, are the only signs of former life we have yet become acquainted with after the most assiduous researches in the Cambrian deposits of such vast dimensions, which are often, I repeat, less altered than much younger rocks replete with organic remains”

In some recent papers published in the geological magazine, I have endeavoured to show that at the close of the Mammoth age there was a very considerable dislocation of the earth's crust, and that a consequence of it was the upheaval of some of the highest masses of land on the earth, including the massive mountains of Asia and the American Cordillera. I now propose to show that (as is à priori probable) there was a concurrent collapse or sinking of the ground over large areas, which, as in the corresponding upheaval, was very rapid, if not sudden.

Mr. A. Vaughan has honoured with a criticism my exposition of the physical principles upon which my Theory of the Origin of Mountain Ranges is founded, which appearedinthis MAGAZINE last May.

Had it not been that much of what I have written seems to have been misapprehended, I should probably have refrained from comment and left the two papers to speak for themselves.