Supplementary Remarks on Glen Roy

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Abstract
In order to have a right conception of the manner in which the Glen Roy Lake originated it is necessary to have some knowledge of the state of matters that preceded it. During the Glacial period the ice upon the West side of Scotland seems to have been vastly thicker than it was on the East, owing no doubt to the snowfall having been much heavier in the former district, just as is now the case with the rainfall there. The amount of rain in the West Highlands is twice or three times what it is on the East coast. This is due not so much to the greater height of the hills as to the fact that the clouds of vapour coming from the Atlantic have most of their moisture condensed there. It is there that the wet sponge is first squeezed. The rain-gauge on the top of Ben Nevis has yielded no less than 145 inches of water in the course of a single year, whereas at Laggan, in the upper part of Strath Spey, the average is 46, and on the shores of the Moray Firth only from 25 to 30 inches. It is also important to observe that it is during winter that the greatest precipitation takes place. In some seasons as much falls on Ben Nevis in the month of December alone as there does near Inverness in the course of a whole year. We shall probably not be war wrong in assuming that during

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