In the summer of 1899, Mr. D. B. Dowling of the Geological Survey explored the upper part of Burntwood river from Three Point lake to its head near Reed lake, Kississing river, from the north end of Athapapuskow lake to its mouth on Churchill river, and the Churchill from above Sisipuk lake to the end of the long arm running from Nelson lake. During the summer of 1893 Mr. Dowling conducted an exploration in that part of southern Keewatin just to the east of the then eastern boundary of Manitoba, and north of the then northern boundary of Ontario. The area covered, now forming part of the province of Ontario, extends from English river and Lac Seul northwards to Berens river, the eastern branch of which forms approximately the northern limit of the area. To the east the exploration included the heads of streams flowing eastward to Cat lake, and on the west White river, a southern branch of Berens river, with the western end of Red lake, confines its extent in that direction. In 1900, J. W. Tyrrell, C.E., D.L.S., who had been assistant to his brother in 1893, conducted an important exploration of the country between Great Slave lake and Chesterfield inlet on Hudson bay. In all, one thousand seven hundred and twenty-nine miles of survey were accomplished, and in the performance of this four thousand six hundred miles were travelled WITH SLEDS AND CANOES. Mr. Tyrrell proceeded via Resolution, Great Slave lake, old Fort Reliance, Lockhart river, Pike’s portage, Artillery lake, Clinton-Colden lake, Smart lake, Sifton lake, Hanbury river and Thelon river to a point near the confluence of Dubawnt river. Hence a portion of the party under the direction of C. C. Fairchild, C.E., was despatched to survey Aberdeen, Schultz and Baker lakes, while Mr. Tyrrell returned up the Thelon to devote his attention to the upper part of the river and the divide between the upper Thelon and Artillery lake, traversing, unattended, the one hundred and sixty miles between a small branch of the Thelon and Artillery lake. The party was reunited at Artillery lake, and returned to civilization via Resolution, Chipewyan and Edmonton.