Discussion of relatively late changes in Alaska that may have had climatic significance is much hampered by the lack of specific information relating to many of the pertinent factors, but even then it is too large a topic to touch more than the fringes of in the short time allotted.One of the speculations that crops up periodically both in its relation to climate and to migrations of animals and plants, is the inquiry into what would be the result if the region near Bering Strait had been at one time more depressed or more elevated than at present. The details of the situation that would have been produced can not be stated with finality, but it seems doubtful whether possible changes of this sort would have effected as radical physical differences as might be conjectured from the casual inspection of an ordinary map. The reason for this conclusion is, that unless depression exceeded 2,300 feet the Strait would maintain practically its present width as the portals at Cape Prince of Wales and at East Cape rise abruptly to elevations of 2,300 and 2,521 feet, respectively, and in the midst of the Strait are three islands, the largest of which is from three to four miles in diameter and has a height of 1,759 feet above the sea. In Seward Peninsula there are no deposits or other evidence that even remotely suggest that the region has been submerged two thousand feet below its present stand during Tertiary time or later.