About the houses of the owner and the overseer, graceful fruit trees, such as bananas and cocoanuts, with some flowering and fragrant plants, are grouped, forming inviting shade and producing a picturesque effect. Not far away, the low cabins of the blacks are half hidden by plantain and mango trees, surrounded by cultivated patches devoted to yams, sweet potatoes, and the like. Some of the small gardens planted by these dusky Africans showed judgment and taste in their management. Chickens and pigs, which were the private property of the negroes, were cooped up just behind the cabins. Many of these plantations employ from four to five hundred blacks, and in some instances the number will reach seven hundred on extensive estates, though the tendency of the new and improved machinery is to constantly reduce the number of hands required, and to increase the degree of intelligence necessary in those employed. Added to these employees there must also be many head of cattle,--oxen, horses, and mules. The annual running expenditure of one of these large estates will reach two hundred thousand dollars, more or less, for which outlay there is realized, under favorable circumstances, a million five hundred thousand pounds of sugar, worth, in good seasons, five cents per pound at the nearest shipping point. There are a few of the small estates which still employ ox-power for grinding the cane, but American steam-engines have almost entirely taken the place of animal power; indeed, as we have shown, it will no longer pay to produce sugar by the primitive processes. This creates a constant demand for engineers and machinists, for whom the Cubans depend upon this country. We were told that there were not less than two hundred Bostonians at the present time thus engaged on Cuban estates. A Spaniard or Creole would as soon attempt to fly like a bird as to learn how to run a steam-engine or regulate a line of shafting. It requires more intelligence and mechanical skill, as a rule, than the most faithful slaves possess. A careful calculation shows that in return for the services of this small band of employees taken from our shores, this country takes eighty per cent. of all the sugar produced upon the island! Twelve per cent. is consumed by peninsular Spain, thus leaving but eight per cent. of this product for distribution elsewhere.