Note.--Since writing the above, I have obtained access to Dall and Harris' "Neocene Correlation Papers," which throw some additional light on the Cretaceous and Eocene Floras of Alaska, which, from its high northern latitude, affords a good parallel to Greenland. It would appear that plant-beds occur in that territory at two horizons. One of these (Cape Beaufort), according to Lesquereux and Ward, holds species of Neocomian Age, and apparently equivalent to the Kootanie of British Columbia and the Komé of Greenland. The other, which occurs at several localities (Elukak, Port Graham, etc.), has a flora evidently of Laramie (Eocene) age, equivalent to the "Miocene" of Heer and Lesquereux, and to the Lignite Tertiary of Canada. The plants are accompanied by lignite, and evidently _in situ_, and clearly prove harmony with Greenland and British Columbia in two of the periods of high Arctic temperature indicated above. _THE GROWTH OF COAL._ DEDICATED TO THE MEMORY OF DR. SCHIMPER, OF STRASBURG, The Author of "La Flore du Monde Primitif," and many other Contributions to Fossil Botany, and of DR. H. R. GOEPPERT, whose Essay on the Structure and Formation of Coal was One of my first Guides in its Study. Questions of Growth and Driftage--Testimony of a Block of Coal under the Microscope--Different Kinds of Coal--Conditions Necessary to Accumulation in Situ--Coal Beds and their Accompaniments--Underclays and Roofs--Vegetable Remains--History of Coal Groups--Summary of Evidence--Subsidence of Coal Areas--Stigmaria and other Coal Plants--Later Coal Accumulations--The Story and Uses of Coal [Illustration: Part of a Coal Group, at the South Joggins, with underclays and erect trees and Calamites (p. 238).] CHAPTER IX. _THE GROWTH OF COAL._ My early boyhood was spent on the Coal formation rocks and in the vicinity of collieries; and among my first natural history collections, in a childish museum of many kinds of objects, were some impressions of fern leaves from the shales of the coal series. It came to pass in this way that the Carboniferous rocks were those which I first studied as an embryo geologist, and much of my later work has consisted in collecting and determining the plants of that ancient period, and in studying microscopic sections of coals and fossil woods accompanying them. For this reason, and because I have published so much on this subject, my first decision was to leave it out of these Salient Points: but on second thoughts it seemed that this might be regarded as a dereliction of duty; more especially as some of the conclusions supposed to be the best established on this subject have recently been called in question.