after the Celtic language had been superseded by the Saxon dialects. Cosmo Innes thus alludes to the subject: "At the earliest period illustrated by the Melrose charters there is sufficient evidence that the southern division of Scotland was not a well-wooded country. On the contrary, the right of cutting wood was carefully reserved when pasturage or arable land was granted; and when that right was conceded for some particular purpose, such as for fuel for a salt-work, or for building, the use was limited in express terms. The high grounds of Ayrshire may be an exception, where there seems to have existed an extensive forest; but elsewhere wood was a scarce and valuable commodity."[45] Though the gradual extinction of our primeval forests, the growth of peat bogs, and many other topographical phenomena, are thus distinctly traceable in the long vista which extends backwards to prehistoric, if not, indeed, to geological times, there are no definite landmarks, beyond a certain chronological sequence, by means of which these physical changes can be more directly measured on the scale of time. Amidst the abundant traces of struggling humanity, by which the whole line of this hazy vista is characterised, we see the remains of these lake-dwellings. The topographical features and environments of Loch Buston, when the crannog-builders commenced their structural operations, were totally different from what they are now. Then a stagnant lake, deeply encroached upon by a marginal zone of aquatic plants, and surrounded by a forest of oaks[46] and other indigenous trees, occupied the site of the present fertile basin; now the whole country-side is laid out into regular and well-cultivated fields, with encircling hedges, and scarcely a tree to mark the once wooded locality, part of which is still significantly known as the Shaws. For upwards of half a century the present farmer has been raising splendid crops of grain, not only from the whole area of the dried-up lake, but over the very site of the crannog. And as for the size of the trees which formerly grew here, I question if there is an oak now growing in the whole of Ayrshire from which a dug-out canoe, having dimensions as large as the one found at Loch Buston, could be made. The scene strongly reminds me of a visit to Ephesus, when, after inspecting the ruins of its once busy harbour, I penned the following words:--