AREA.-The area of Rhode Island is 1,306 square miles, and of Delaware, 2,120, being 38 per cent., or much more than one third larger than Rhode Island. Retaining their respective ratios of increase, per square mile, from 1790 to 1860, and reversing their areas, the population of Rhode Island in 1860, would have been 283,465, and of Delaware, 78,268. In natural fertility of soil Delaware is far superior to Rhode Island, the seasons much more favorable for crops and stock, and with more than double the number of acres of arable land. PROGRESS OF WEALTH.--By Census Tables 33 and 36 (omitting commerce), it appears that the products of industry as given, viz., of agriculture, manufactures, mines, and fisheries, were that year, in Rhode Island, of the value of $52,400,000, or $300 per capita, and in Delaware, $16,100,000, or $143 per capita. That is, the average annual value of the product of the labor of each person in Rhode Island is greatly more than double that of the labor of each person in Delaware, including slaves. This, we have seen, would make the value of the products of labor in Rhode Island in 1930, $132,363,600, and in Delaware, only $30,469,582, notwithstanding the far greater area and superior natural advantages of Delaware as compared with Rhode Island. As to the rate of increase: the value of the products of Delaware in 1850 was $7,804,992, in 1860, $16,100,000; and in Rhode Island, in 1850, $24,288,088, and in 1860, $52,400,000 (Table 9, Treas. Rep., 1856), exhibiting a large difference in the ratio in favor of Rhode Island. By Table 36, p. 196, Census of 1860, the cash value of the farm lands of Rhode Island in 1860 was $19,385,573, or $37.30 per acre (519,698 acres), and of Delaware, $31,426,357, or $31.39 per acre. (1,004,295 acres). Thus, if the farm lands of Delaware were of the cash value of those of Rhode Island per acre, it would increase the value of those of Delaware $5,935,385, whereas the whole value of her slaves is but $539,400. But by Table 35, Census of 1860, the total value of the real and personal property of Rhode Island in 1860, was $135,337,588, and of Delaware, $46,242,181, making a difference in favor of Rhode Island, $89,095,407, whereas, we have seen, in the absence of slavery, Delaware must have far exceeded Rhode Island in wealth and population. The earnings of commerce are not given by the census, but, to how vast an extent this would swell the difference in favor of Rhode Island, we may learn from the Census, Bank Table No. 34. The number of the banks of Rhode Island in 1860, was 91; capital, $20,865,569; loans, $26,719,877; circulation, $3,558,295; deposits, $3,553,104. In Delaware, number of banks, 12; capital, $1,640,775; loans, $3,150,215; circulation, $1,135,772; deposits, $976,223. Having shown how much slavery has retarded the material progress of Delaware, let us now consider its effect upon her moral and intellectual development.