The Garavaig furnace stood in a slight hollow in the east corner of what is now the easternmost field of the Slatadale farm, close to where the Garavaig burn (on which are the Victoria Falls) runs into Loch Maree. They say the water-power of the burn was anciently increased by artificial means. When I first examined the field where the furnace stood it was newly ploughed, and part of it was stained black with fragments of charcoal, indicating extensive burnings. The farmer stated that he had buried immense quantities of slag in the drains and soil of this recently reclaimed field. There are still numerous fragments of No. 1 slag on the surface, so that the furnace belonged to the ancient class. The farmer said that he had noticed indications of there having been a furnace in the slight hollow already mentioned, and the fragments of slag are thickest there. The agricultural operations have reduced the place almost to a dead level. No kind of iron ore is found, but the locality is just the place where one would have expected "pans" of bog iron might have occurred. 6. RED SMIDDY, NEAR POOLEWE. The remains of the iron furnace on the river Ewe are still called A Cheardach Ruadh, or "the Red Smiddy." They are more perfect, and therefore to some extent more attractive to one studying the subject, than any of the others. Unquestionably they are also more recent. That the Red Smiddy was part of Sir George Hay's undertaking appears certain; but it was very likely under his manager or factor that it was established, and probably a number of years later than the Letterewe furnace. The slags are exclusively of class No. 2, and closely resemble those formed in blast-furnaces at the present day, thus demonstrating the progress Sir George made in the art of the manufacture of iron after his commencement at Letterewe. Mr Macadam finds that this light slag is completely soluble in acids, and that it contains 16 per cent. of oxide of calcium, and only 23 per cent. of metallic iron. The ore found on the bank above the Red Smiddy and elsewhere near its remains are of the No. 3 class. Many of the fragments of ore have been roasted. This process does not seem to have been adopted at any of the other furnaces. It is another indication of the more recent date of the Red Smiddy, and of the improvements in the methods pursued there. The Letterewe and Talladale furnaces appear to have been originally established solely for the smelting of bog iron (No. 1). Gradually the paucity of that ore, the advantage of mixing imported ores with it, and their superior quality, led to the introduction of the latter; and then the convenience of having a furnace near the place where these imported ores were landed, led to the establishment of the Red Smiddy. No doubt timber for charcoal burning was at first obtainable in every direction, and afterwards, if there were not a sufficient quantity standing near the Red Smiddy, it