Mr. Jefferson estimates the population of the Powhatanic confederacy or group of tribes, at one individual to the square mile.[7] Gov. Clinton, who ably handled the subject in a discourse in 1811, estimates that, if this rule be applied to the domain of the Iroquois in New-York, an aggregate of not less than 30,000 would be produced;[8] but he does not pass his opinion upon an estimate made so completely without reliable data. [7] Notes on Virginia. [8] Coll. N. Y. Hist. Soc. vol. 2. At a conference with the five cantons at Albany, in 1677, the number of warriors was carefully made out at 2,150, giving, on the preceding mode of computation, a population of 10,750, and this was the strength of the confederacy reported by an agent of the Governor of Virginia, who had been specially despatched to the conference for the purpose of obtaining this fact. Either, then, in the subsequent estimates of 1756, ’60, and ’64, the population had been underrated, or there had, on the assumption of the truth of the above enumeration, which is moderate, been a decline in the population of 3,000 souls in a period of eighty-seven years. That there was a constant tendency to decline, and that the cantons were aware of this, and made efforts to keep it up, by the policy of their conquests, is apparent, and has before been indicated. During the American revolution, which broke out but eleven years after the expedition and estimate of Bouquet, when he had put the Iroquois at 1,550 fighting men, it is estimated that the British government had in their interest and service 1,580 warriors of this confederacy. The highest number noticed of the friendly Oneidas and a few others, who sided with us in that contest, is 230 warriors, raising the number of armed men engaged in the war, to 1,810, and the gross population in 1776 to 9,050 souls. This estimate, which appears to have been carefully made, from authentic documents, is the utmost that could well be claimed. It was made at the era when danger prompted the pen of either party in the war to exhibit the military strength of this confederacy, in its utmost power; and we may rest here, as a safe point of comparison, or, at least, we cannot admit a higher population. By the census returns herewith submitted, the aggregate population of the three full, and four fragmentary cantons, namely, the Oneidas and Cayugas, &c. still residing within the State, are denoted to be as follows, namely: Senecas, 2,441 Onondaga, 398 Tuscaroras, 281 Oneidas, 210 Cayugas, 123 Mohawks, 20 St. Regis Canton, 360