must have similar relations to it, that an animal with the most delicate nasal organs has to air. A vulture or a dog scents not only particular food and particular game at great distances, but even makes of the smell a kind of language; and I doubt not, that when dogs, that have been blindfolded and carried away from their home, return to it, it is by the sense of smelling: to them each town, lane, or field, must have a particular scent. And I have seen even a blind horse, an animal in which the sense of smelling is less acute, evidently find his way by it to his master’s house and stable, which was, indeed, near a tan-yard. The state of parts of water, in the sea or great lakes, produced by the impregnations carried down by particular streams, is much more permanent than a _like state_ in air: so that though the knowledge given by the nasal organs may be more easily communicated at a distance by winds, yet _that_ produced by streams on the bronchiæ of fishes is more invariable, and a migratory fish is less likely to be deceived. Yet in great floods, often connected with storms, or violent motion in the waters near the shore, salmon sometimes mistake their river. I remember in this way, owing to a tremendous flood, catching with the fly a large salmon, that had mistaken his river, having come into the Bush, near the Giant’s Causeway, instead of the Bann. No fish can be more distinct in the same species than the fish of these two rivers, their length to their girth being nearly in a ratio of 20:9 and 20:13.—I am going; good sport to you. EVENING. HAL.—I am sure I may congratulate you on your sport, for I see on the bank a fine salmon, three grauls or grilses, and three large sea trout. ORN.—You have not seen all, for we have crimped two fish—one a large salmon, and the other a trout almost a yard long, and both in excellent season. We have had great sport, and sport even of a kind which you will not guess at; for, when the tide was falling, the fish ceased to rise at the fly, and I thought of trying them with a bait; so we sent for our swivel tackle, and put par or samlet on our hooks, as we bait for pike—cutting off one ventral fin on one side, and one pectoral fin on the other; and making the par spin in the most rapid streams, we had several runs from fish, and it was in this way that Poietes caught this large sea trout, which gave excellent sport. HAL.—This kind of fishing is not uncommon. I have often caught salmon in the Tay, fishing with pars; but though the fish ran at the bait, when they would not rise at the fly while the tide was ebbing, they would have taken the par better still while it was flowing. PHYS.—From my experience to-day, I conclude the salmon has habits different from the trout; for I think the fish which broke my hook rose again at the artificial fly in the same place.