During our short visit to the harbour of Churchill a strong gale of wind with rain prevailed, so that no fresh geological work could be attempted beyond the limits which had been explored in this vicinity in 1879. On the return voyage from Churchill, we visited a large chain of islands in the north-eastern part of Hudson’s Bay, which run north-eastward between latitudes 59° and 60°, terminating in that direction, east of latitude 80°. On some sketch-charts, a group of islands in this part of the bay had been marked “Sleepers,” but as there are also two other groups called North Sleepers and South Sleepers, not far off, Lieutenant Gordon and I named these the Ottawa Islands, in order to distinguish them clearly and to prevent confusion. Lieutenant Gordon made a running survey of the northern part of the chain, and we named the individual islands in honor of the citizens of Ottawa who had generously aided in missionary enterprise in Hudson’s Bay. A copy of Lieutenant Gordon’s chart of the Ottawa Islands accompanies this report. The outermost of these shown on the chart, and called J. Gordon Island, consisted of thick, stratified masses, presenting a variety of external appearances, and probably of volcanic origin, all dipping westward at a moderate angle, as represented in the accompanying outline of the island. [Illustration: J. GORDON ISLAND FROM THE NORTH.] [Sidenote: Greenish-grey diorite.] [Sidenote: Copper pyrites and asbestus.] [Sidenote: Glacial striæ.] An opportunity was afforded me of landing upon a small island lying about two miles to the south-west of Gilmour Island (see chart) in latitude 59° 48′, longitude 80° 6′. It was found to consist entirely of a greenish-grey diorite, which, on fresh fracture, is mottled with darker and lighter shades. In a vertical section, found on the east side of the island, the diorite presents the “bouldery” or concretionary appearance shown in the annexed sketch, the larger divisions having a diameter of about two feet. The rock is cut by small veins of quartz, running in a northwesterly course (true) in which specks of copper pyrites were detected. It also contains thin, short and irregular veins of asbestus and green epidote. Old weathered surfaces of the diorite are very rough, but nearly the whole island bears the marks of glaciation. On the southern and central parts of the island the principal striæ run N. 60° to 80° E., magnetically, or N. 20° to 40° E., astronomically, the variation of the compass having been found to be about 40° W. Another set of grooves, near the centre of the island, was found to run S. 65° E. mag., or about N. 75° E., true. On the east side of the island the grooves run N. 35° E. mag. or N. 5° W., true. [Illustration] [Sidenote: Northward course of drift.] [Sidenote: Belcher Islands.]