Biscayne Bay abounds with a great variety of fish, and is also the favorite haunt of the green turtle; it here finds an abundance of the peculiar seaweed it prefers and on which it thrives and fattens, and the water swarms with them. Key West offers a market for all that can be caught, and turtle catching, in this section, is a most lucrative employment. Sponges are very abundant, and a large trade is now carried on in Key West in this article. The sponges taken from these waters probably realize for the gatherers fifty to seventy-five thousand dollars per annum.” Northern persons, in going to this section, must leave behind them all their preconceived ideas as to soil, for they will find that the above-mentioned rocky pine lands are “the very best” for the cultivation of most of the tropical fruits, but the prairie lands, to use the language of Col. M. A. WILLIAMS (the State agent for the survey and location of the lands granted to the State by the general government), “are inconceivably rich, beyond description,” and are well adapted to the growth of the most exhausting crops of sugar cane and tobacco. L. D. STICKNEY, says in his pamphlet on Florida, “It is a great mistake to suppose that sugar cannot be made to advantage without the investment of large capital. The cane produced on less than ten acres of ground, is usually ground in a wooden mill, which does not cost more than $100 (generally the work of the farmer himself), while the juice is boiled in the common utensils of the kitchen, or at best, as the New England farmer manufactures his maple sugar. The yield is usually greater, in proportion to the stock worked, than where the machinery has cost ten or fifteen thousand dollars! Cane is cultivated with more ease than corn, not requiring so much hoeing. From midsummer to the time of harvesting, the hands may be employed in other business; and even at the time of taking off the crop, no great increase of hands is required, as in Louisiana or Texas, where frost prevails. One hand can cultivate six acres with the hoe, or ten to twelve with the aid of a horse and plough. At the same time he can raise other crops sufficient to subsist himself and family. Twelve hundred pounds of sugar to the acre, is an average yield, though four thousand pounds have been produced. (This refers to the yield on land further north than Biscayne Bay; it is very certain that the larger yield can be relied upon in this locality.) “The molasses is always expected to pay the expense of manufacturing.” Col. M. A. WILLIAMS, while engaged in the United States survey in 1874, writes: “This country is attracting attention; those who are here (and there are several from various States, who have come since January), are perfectly delighted.” WM. M. SWAN, who was with him, writes, “Biscayne Bay comes up to the preconceived idea general with strangers in Florida. If this place (I mean the entire Bay), had a competent party to write it up as it is, into notice, the larger part of the travel and investment would undoubtedly center here.” “The whole of Biscayne Bay, is far more beautiful than the scenery along the Indian river and the St. Johns.”  * * * * *  “We met here a Mr. SAMUEL ROGERS, of Omaha, seeking health, and a desirable tropical home for his family. After carefully plodding over the beaten track, the St. Johns and Indian river, he finally selected this as the Eldorado he had been seeking. Mr. ROGERS is one of the founders of the new thriving city of Omaha.” Under date of May 30th, he writes: “The nights are always pleasant, calling for a blanket before morning. I must admit, that with the exception of Key Largo, I have not found mosquitoes any thing as bad on the whole, as I was led to believe.”  * * * * *  A Mr. JONES, of New York, reported to be very wealthy, says, “he has traveled over the continent of Europe two or three times; has visited all of the Islands of the Mediterranean in search of a climate favorable to his (heart) disease. He decides unequivocally in favor of the Bay, and announces his intention to buy a small tract of land, put up a splendid cottage, stock an orchard complete in every fruit suitable, have his steam yacht on hand for his convenience to travel anywhere; but his home must be here. The climate he says, is far more agreeable and delightful the year round than any he has found.” He has been boarding with Mr. ADDISON for one or two seasons. We see plenty of deer, and one of our party on Sunday killed one and wounded another. Mr. NOYES brought in a live fawn and saw ten yesterday, although too shy to get a shot. Partridges are numerous. I wish I could have time to write fully on the fruits that could be grown here. Bananas, plantains, etc., the year around. The Rev. D. W. W. HICKS, of Miami, Biscayne Bay, Dade county, in a speech, made before the Florida Fruit Growers Association, said: “Mr. President and gentlemen—I place myself below ‘the frost line’ and within a territory, the most beautiful by nature, and the most susceptible to the attentions of industrial art, probably, on the continent. It may not compare in rugged grandeur with the far West, up the canyons of the Yellowstone, or within the picturesque valleys of the Rocky mountains; but more beautiful, because with us, nature is in repose and at rest, holding in her lap the riches of a semitropical clime, adorned with the perpetual bloom of Spring, and regaled with the unceasing concerts of the oriole and mocking bird.  * * * * * *  Who can do justice to that climate? The sick are restored to health, the poor may speedily become rich by industry.  * * * *  While borne upon every breeze is the balmy health giving breath of the Gulf Stream.” BYRON in one of his rhapsodies, speaks of being “intoxicated with eternity.” The sentiment seems vague and almost unnatural, but whoever casts himself into the eddying blessings of the climate of which I speak, will, if he have a spark of sentiment, forgive the poet’s license. The rheumatic and the consumptive, with ordinary care, lose their ailments with us. Eighteen months ago, one came from the hyperborean regions of the North, lame and almost despairing. He was accompanied with crutches. A few months enabled him to throw them aside, and to-day you would rejoice to take a tramp with him through the Coontie forest, or better still a sail in his boat upon the bosom of the Bay of Biscayne. He is well. Rheumatism and my friend have parted company, and his crutches are the relics of a past age. The climate suits the consumptive, because rude, abrupt changes in the atmosphere are almost unknown. The Gulf Stream hugs our shores so devotedly that from the North, Northeast, East, Southeast and South, no chill can obtrude upon us. The strongest breeze is tempered with a warm and genial spirit. It is impossible to conceive of a more perfect climate, taking it all in all. Of course we have plenty of sunshine, and hot sunshine too; but with the sunshine comes the breeze, and not a day in the whole year need be lost on account of the heat.  * * * * * *  If the soil is thin, for the most part it is very rich and yields abundantly

. The rock is near the surface when it does not protrude and is soft, nutritious to plants, and otherwise valuable and useful. “What will grow there?” Every thing that I see about me in this hall except discontent! (The platform on which the gentleman stood was covered with various fruits: oranges, lemons, limes, citrons, bananas, and many varieties of vegetables.) This looks like home. I see familiar