EDWARD HARRIS joined me, but the Revenue Cutter had not made its appearance; and time becoming precious, on account of the approach of spring, we bid adieu to all at Charleston, and pushed for New Orleans, where, I was informed by Government letters, I should meet with a vessel. On reaching Augusta in Georgia, I called on Dr WRAY, who promised to forward to me a number of plants for my noble friend Lord RAVENSWORTH, who has received them in good order. After several days of severe travelling, we arrived at Montgomery in Alabama, and meeting there with a steam-boat bound to Mobile, secured our passage. Next day we arrived there, and spent two days in examining the neighbourhood; after which we proceeded to Pensacola, where I felt proud to find a harbour commodious enough to contain a fleet sufficient to repel the attacks of any naval force brought against the United States. Here I made the long-sought-for acquaintance of Mr INNERARITY, to whom I had letters from my friend ALEXANDER GORDON, Esq., and who introduced us to all who were likely to forward our views. The next morning he accompanied us on board the United States’ frigate, the Constellation, and presented us to Commodore DALLAS, to whom I had letters of introduction from our government. This polite and gallant officer received us all with great kindness, and, after reading my letters, assured me that as soon as a cutter could be spared, it should be at my service, and that the information would be transmitted to me through the medium of the Collector of Customs at Mobile or New Orleans. After searching the country around Pensacola, we returned to Mobile, and proceeded to New Orleans in a steamer, by way of the great lakes. Having previously received the most pressing invitation from my friend JAMES GRIMSHAW, Esq., my son and I went at once to his house, where we were treated with all the kindness to be expected from a true English gentleman. I had the pleasure of renewing my acquaintance with Ex-Governor ROMAN, and several members of his most amiable family, among whom was Mr ZARINGUE. From that gentleman I received much valuable information respecting some of our birds, as well as from my long-known acquaintance, the great sportsman Mr LOUIS ADAM. Here also I for the last time met with good M. LE SUEUR, well known to the world of science as a zoologist of great merit, and with whom I first became acquainted at Philadelphia in 1824. He, alas! is now no more.