And this increase of numbers will by no means be attended with a corresponding increase of expense to the department. In 1837, when the number of papers was twenty-nine millions, there were 11,767 post-offices, and mails were carried 36,228,962 miles. In 1844, the post-offices were 15,146, an increase of twenty-nine per cent., and the mail transportation was 38,887,899 miles, an increase of seven per cent., while the increase of newspapers was eighty-nine per cent.; and yet the expenditure was $3,380,847 in 1837, and $3,979,570 in 1847; an increase of less than eighteen per cent. Deducting the necessary additional expense of adding twenty-nine per cent. to the number of post-offices, and seven per cent. to the distance of transportation, and it will be fair to conclude that doubling the number of newspapers would not add above ten per cent. to the cost of transportation. Make any reasonable allowance, even fifty per cent. for the labor in the post-offices, and you have still a net profit of forty per cent. on all the newspaper postage that shall be added. And this in addition to the benefits of the diffusion of knowledge, increasing the mutual acquaintance of the people of this wide republic, and thus increasing the stability of our government, the permanence of our union, the happiness of the people, and the perfection of our free institutions. VIII. _Pamphlet and Magazine Postage_. The postage on pamphlets was regulated on the principles of cheap postage, with a special discrimination in favor of those pamphlets which were published periodically. This latter distinction was construed so liberally, that it was allowed to include among periodicals all pamphlets published annually, such as almanacs, college catalogues, reports of societies, and the like. The law of 1845 abolishes the distinction between periodical and occasional pamphlets, but makes a difference in favor of large pamphlets, by charging two and a half cents on all pamphlets weighing less than one ounce, and one cent for each additional ounce.