Mr. Preble in his published report (North American Fauna No. 27) presents a map of the Northland, showing the “life zone.” What he calls “the Canadian zone” extends from the southern margin of the map to an irregular line trending in a northwesterly direction from a point about 52·30° north latitude, just south of Hudson bay, to a point about 58·30° north latitude at Rocky mountains. The main irregularity in the course of the northern boundary of this zone is due to a wedge shaped projection into the zone to the north, due to the well known northern trend of the isothermal lines from a point in eastern Saskatchewan. The line from about longitude 150° runs direct across Lake Athabaska, cutting it in half practically, then to the mouth of Slave river on Great Slave lake, thence in a sweep to where the 65th parallel of north latitude strikes the Mackenzie. Thence the line runs back southeast to the Liard, following that stream to the western margin of the map. North of the “Canadian” zone, the “Hudsonian” zone is represented, its northern limit being an irregular line running northwesterly from north latitude 55·11° on Hudson bay to the delta of the Mackenzie. This zone is represented as extending northward in wedge shaped projections for some distance down the valley of the Dubawnt, down that of the Coppermine, and into the lake country north of Great Bear lake. All of the country north of this is described by Mr. Preble as the “Arctic zone.” Mr. Preble remarks in his report:—“The northern border of the Canadian zone in the Mackenzie region limits the successful cultivation of barley, potatoes, and the more hardy root crops, although with special care most of them are raised in certain favoured localities in the southern part of the Hudsonian. Even in the Canadian, however, an occasional failure occurs, in the case of the less hardy crops, because of the occurrence of unusually late spring or early autumn frosts. In most parts of Peace river valley, and even in lower Liard valley, wheat is a successful crop. Peas, potatoes, radishes, turnips, beets, carrots, cabbages, lettuce and onions are raised with a considerable degree of success as far north as Fort Norman, near latitude 65°, near the northern extremity of the Canadian strip. Nearly all of these meet with a fair amount of success at Fort Rae and also at Fort Good Hope, in the lower Hudsonian, but at Fort Rae the situation is specially favourable as regards slope exposure, and the permanent frost, which remains near the surface in most parts of the Hudsonian, probably retreats to a much lower depth. At Fort Good Hope the almost continuous sunlight of summer probably compensates in part for its extreme northern position.”