Calculations founded upon the statistics of "church accommodations" given in the United States census--that is, of the number of persons the churches are capable of holding--are not applicable to our case; because the Catholic churches, especially in the large cities, are thronged two or three times every Sunday by as many distinct congregations, while the Protestant churches have only one service for all. The capacity of the churches therefore gives us neither the actual number of worshippers nor the proportion between our own people and those of other denominations. We have taken, then, as the basis of our estimate, the ratio between the number of priests and the number of the faithful, correcting the result according to the circumstances of particular places. The first point is to establish this ratio, and we are led by the concurrent results of careful estimates made in some of the States, and special or general calculations which we have had opportunity of making in person, to fix it at the average of one priest for every 2,000 Catholics. But we have a very trustworthy method of verifying this estimate, and that is by comparison between the United States and the contiguous British Provinces, in which the statistics of religious belief are included in the general census. Setting aside Lower Canada, where the Catholic population is as compact as it is in France, we find that in Upper {8} Canada, a country which resembles the Western United States, the ratio in 1860 was one priest for every 1,850 Catholics, and in New Brunswick, a territory very like New England, one for every 2,400. Our average ratio of one for every 2,000 cannot, therefore, be far from the truth. We have made due account of all data by which this ratio could be either raised or lowered in particular times and places. We have ourselves made investigations in certain districts, and persons well qualified to speak on the subject have given us information about others. The result of our corrected calculation gives us 4,400,000 as the Catholic population of the United States in 1860, the date of the last general census. We shall give presently the distribution of this total among the several states; but we wish first to call attention to another fact of great importance which appears from our figures. In 1808 the Catholics were 100,000 in a total population of 6,500,000, or 1/65th of the whole; in 1830 they were 450,000 in 13,000,000, or 1/29th of the whole; in 1840, 960,000 in 17,070,000, or 1/18th; in 1850, 2,150,000 in 23,191,000, or 1/11th; and finally, in 1860 they were over 4,400,000 in 31,000,000, or 1/7th of the total population. It thus appears that for fifty years the Catholics have increased much faster than the rest of the inhabitants, and especially during the last two decades. Between 1840 and 1850 their ratio of increase was 125 per cent., while that of the whole population was only 36; and from 1850 to 1860 their ratio of increase was 109 per cent., while