1. The mechanics of this principle have been worked out recently byW. Riedel [82]; see also [83], p. 151.
2. According toSchott ([89], p. 291), the Sargasso sea-weeds are found floating in long streaks, parallel with the local ocean current.
3. How very strong the surface friction is, even in media as rarefied, as air, may be seen from a passage in a paper byJ. A. Huxley (Atlantic Nonthly, Sept. 1929, p. 295).
4. It is assumed that the reader is familiar with Bowen’s theory [16] and the alternative views ofCushing [33] andW. J. Miller [68].
5. Based entirely on field observations in the Adirondacks, the conclusions reached in this paper apply exclusively to the Adirondacks. The writer in no way intends to formulate or even to suggest a mode of formation of other areas of anorthosite. Therefore the papers byLoewinson-Lessing [59],Grout [42 a],T. Vogt [98],Mawdsley [61],Fowler [39] andSmith [92] will not be considered as their authors were unfamiliar with the Adirondacks.