...lation in 1860, just as a thrifty trader on balancing his accounts will indulge himself in computing the prospective accumulations of such a surplus as he has just discovered.--They made out that the United States would contain at the period which has now arrived an aggregate population of 31,095,535. The reckoning has actually been verified, and with a little to spare. The numbers are 31,374,856. Nothin...