Having passed Glen Turit, the three lines now become distinct and well marked on the right side, where the hill is covered with a thick alluvium: on the opposite side they are also distinct, although here and there slight appearances of irregularity, and supernumerary marks occur. The bottom of the glen continues to exhibit an
many of them being objects of general curiosity, even when not particularly connected with this subject year.
| feet | |
| Upper line of Glen Roy, above the Western sea at Loch Eil | 1262 |
| Ditto above the German sea | 1266 |
| Lowest line of ditto, above the Western sea | 976 |
| Upper line of ditto, above the land at Loch Oich | 1180 |
| Lowest line of ditto, above the same | 886 |
| Upper line above the second of Glen Roy | 82 |
| Second line above the lowest ditto | 212 |
| Upper line of Glen Roy, above the junction of the Roy and Spean | 927 |
| Lowest ditto, above the same place | 633 |
| Upper line of ditto, above the bottom of the Glen where the Roy enters it | 283 |
| Height of the bottom at that place above the lowest line. | 11 |
| Upper line of Glen Roy above Loch Spey | 63 |
| The bottom of Glen Roy at its upper end, above its bottom at the junction of the Roy and Spean; or its declivity | 644 |
| Height from the junction of the Roy and Spean to the sea | 343 |
| Observed upper lane of Glen Gloy, above the Western sea. | 1274 |
| Difference of level between ditto and the upper line of Glen Roy | 12 |
| Height of Loch Spey above Garvamore | 294 |
| Ditto above the German sea | 1203 |
| Height of Garvamore, or fall of the Spey hence to the sea | 909 |
| Depression of the eastern barrier of Loch Laggan, below the upper lane of Glen Roy | 432 |
Whatever doubts we may have respecting the general value of the method by which the elevation of the upper lane of Glen Roy was ascertained, I must here remark that this principal measurement receives confirmation, to a certain extent at least, by comparison with the height of that land which is the common division of the Truim and the Garry. This point has been found by levelling to be 1460 feet, and it appears probable from comparing the course of the former river and that of the Spey to their common junction, that the source of the Spey cannot be materially different in elevation; a circumstance confirmed by the barometric observations. The other measurements in the table scarcely admit of any material errors.
