About four o'clock in the afternoon of the 6th of May we were convoyed, by a large party of friends, to the "Henry Clay," on board of which accommodations had been secured for us by great exertion on the part of a fellow-voyager. The "Henry Clay" had the highest reputation of any boat on the river, having made ninety-six trips without accident; a rare feat on this dangerous river. As I was stepping on board, Judge P. said he hoped we were each provided with a life-preserver. I concluded he was in joke; but he declared himself perfectly serious, adding that we should probably find ourselves the only cabin passengers unprovided with this means of safety. We should have been informed of this before; it was too late now. Mr. E., of our party on board, told me all that this inquiry made me anxious to know. He had been accustomed to ascend and descend the river annually with his family, and he made his arrangements according to his knowledge of the danger of the navigation. It was his custom to sit up till near the time of other people's rising, and to sleep in the day. There are always companies of gamblers in these boats, who, being awake and dressed during the hours of darkness, are able to seize the boats on the first alarm of an accident in the night, and are apt to leave the rest of the passengers behind. Mr. E. was a friend of the captain; he was a man of gigantic bodily strength and cool temper, every way fitted to be of use in an emergency; and the captain gave him the charge of the boats in case of a night accident. Mr. E. told me that, as we were particularly under his charge, his first thought in a time of danger would be of us. He had a life-preserver, and was an excellent swimmer, so that he had little doubt of being able to save us in any case. He only asked us to come the instant we were called, to do as we were bid, and to be quiet. As we looked at the stately vessel, with her active captain, her two pilots, the crowds of gay passengers, and all the provision for safety and comfort, it was scarcely possible to realize the idea of danger; but we knew that the perils of this extraordinary river, sudden and overwhelming, are not like those of the ocean, which can be, in a great measure, guarded against by skill and care. The utmost watchfulness cannot here provide against danger from squalls, from changes in the channel of the river, and from the snags, planters, and sawyers (trunks of trees brought down from above by the current, and fixed in the mud under water) which may at any moment pierce the hull of the vessel.

Our New-Orleans friends remained with us upward of an hour, introducing us to the captain, and to such of the passengers as they knew. Among these were Mr. and Mrs. L., of Boston, Massachusetts. We little imagined that afternoon how close an intimacy would grow out of this casual meeting; how many weeks we should afterward spend in each other's society, with still-increasing esteem and regard. The last thing one of my friends said was that he was glad we were going, as there had been forty cases of cholera in the city the day before.

After five o'clock the company on deck and in the cabins, who had bidden farewell to their friends some time before, began to inquire of one another why we were not setting off. We had found the sun too warm on deck, and had had enough of mutual staring with the groups on the wharf; we turned over the books, and made acquaintance with the prints in the ladies' cabin, and then leisurely arranged our staterooms to our liking; and still there was no symptom of departure. The captain was obviously annoyed. It was the non-arrival of a party of passengers which occasioned the delay. A multitude of Kentuckians and other western men had almost forced their way on board as deck-passengers; men who had come down the river in flatboats with produce, who were to work their way up again by carrying wood at the wooding-places, morning and evening, to supply the engine fire. These men, like others, prefer a well-managed to a perilous boat, and their eagerness to secure a passage was excessive. More thronged in after the captain had declared that he was full; more were bustling on the wharf, and still the expected party did not come. The captain ordered the plank to be taken up which formed a communication with the shore. Not till six o'clock was it put down for the dilatory passengers, who did not seem to be aware of the inconvenience they had occasioned. They were English. A man on the wharf took advantage of the plank being put down to come on board in spite of prohibition. He went with his bundle to the spot on the second deck which he chose for a sleeping-place, and immediately lay down, without attracting particular notice from any one.

We braved the heat on the hurricane deck for the sake of obtaining last views of New-Orleans. The city soon became an indistinguishable mass of buildings lying in the swamp, yet with something of a cheerful air, from the brightness of the sun. The lofty Cotton-press, so familiar to the eye of every one acquainted with that region, was long visible amid the windings of the river, which seemed to bring us quite near the city again when we thought we should see it no more.

At seven we were summoned to supper, and obtained a view of the company in whose society we were to pass the next ten days. There was a great mixture. There was a physician from New-York, with his wife and a friend or two; an ultra-exclusive party. There were Mr. and Mrs. B., also from New-York, amiable elderly people, with some innocent peculiarities, and showing themselves not the less mindful of other people from taking great care of each other. There was the party that had kept the captain waiting, some of them very agreeable; and the L.'s, whom it would have been a privilege to meet anywhere. There were long trains of young men, so many as to extinguish all curiosity as to who they were and where they came from; and a family party belonging to the West, father, mother, grandmother, and six children, who had a singular gift of squalling; and their nurses, slaves. These are all that I distinctly remember among the multitude that surrounded the almost interminable table in the cabin. This table, long as it was, would not hold all the company. Many had to wait till seats were vacated, and yet we were to go on receiving passengers all the way to Natchez.

We took in more this evening. After supper we hastened again to the hurricane deck, where the air was breathing cool, and, to our great joy, strong enough to relieve us from moschetoes. The river was lined with plantations of cotton and sugar, as it continued to be for two hundred miles farther. Almost every turn of the mighty stream disclosed a sugarhouse of red brick, with a centre and wings, all much alike. Groups of slaves, most of them nearly naked, were chopping wood, or at other kinds of toil along the shore. As the twilight melted into the golden moonlight of this region, I saw sparkles among the reeds on the margin of the stream. It did not occur to me what they were till I saw a horse galloping in a meadow, and apparently emitting gleams of fire. I then knew that I at length saw fireflies. One presently alighted on the linen coat of a gentleman standing beside me, where it spread its gleam over a space as large as the palm of my hand, making the finest of the threads distinctly visible.

In a dark recess of the shore a large fire suddenly blazed up, and disclosed a group of persons standing on the brink of the stream. Our boat neared the shore, for this was a signal from a party who had secured their passage with us. Night after night I was struck with the same singular combination of lights which I now beheld; the moonlight, broad and steady; the blazing brands, sometimes on the shore, and sometimes on board the flatboats we met; and the glancing fireflies.

When we went down for the night we had our first experience of the crying of the little H.'s. They were indefatigable children; when one became quiet, another began; and, among them, they kept up the squall nearly the twenty-four hours round. Their mother scolded them; their nurses humoured them; and, between these two methods of management, there was no peace for anybody within hearing. There was a good deal of trampling overhead too. Many of the deck passengers had to sleep in the open air, on the hurricane deck, from their being no room for them below; and, till they had settled themselves, sleep was out of the question for those whose staterooms were immediately beneath. At length, however, all was quiet but the rumbling of the engine, and we slept.

When I went on deck in the morning, before six, I was privately told by a companion that the man who had last forced his way on board had died of cholera in the night, and had been laid under a tree at the wooding-place a few minutes before. Never was there a lovelier morning for a worn wretch to lie down to his long sleep. The captain particularly desired that the event should be passed over in entire silence, as he was anxious that there should be no alarm about the disease on board the boat. The poor man had, as I have mentioned, lain down in his place as soon as he came among us. He lay unobserved till two in the morning, when he roused the neighbour on each side of him. They saw his state at a glance, and lost not a moment in calling down the New-York physician; but, before this gentleman could get to him, the sick man died. His body was handed over to the people at the wooding-place, and buried in the cheerful morning sunshine. We sped away from that lonely grave as if we were in a hurry to forget it; and when we met at breakfast, there was mirth and conversation, and conventional observance, just as if death had not been among us in the night. This was no more than a quickening of the process by which man drops out of life, and all seems to go on as if he had never been: only seems, however. Even in this case, where the departed had been a stranger to us all, and had sunk from amid us in eight hours, I believe there were few or no hearts untouched, either by sorrow for him or fear for themselves. We were none of us as we should have been if this his brief connexion with us had never existed.

All the morning we were passing plantations, and there were houses along both banks at short intervals; sometimes the mansions of planters, sometimes sugarhouses, sometimes groups of slave-dwellings, painted or unpainted, standing under the shade of sycamores, magnolias, live oaks, or Pride-of-India trees. Many dusky gazing figures of men with the axe, and women with the pitcher, would have tempted the pencil of an artist. The fields were level and rich-looking, and they were invariably bounded by the glorious forest. Towards noon we perceived by the number of sailing-boats that we were near some settlement, and soon came upon Donaldsonville, a considerable village, with a large unfinished Statehouse, where the legislature of Louisiana once sat, which was afterward removed to New-Orleans, whence it has never come back. Its bayou boasts a steamer, by which planters in the south back-country are conveyed to their estates on leaving the Mississippi.