At about this time several horse and cross post mails had been molested, and it was desired, in response to a considerable public agitation, to establish mail-coaches on the minor posts. This would have involved heavy cost, and as an alternative Freeling (Secretary to the Post Office, afterwards Sir Francis) suggested that only responsible persons should be employed--at this time the post riders, in fact as well as name, were in many instances mere boys--and that the riders should be armed. In order to obtain funds to meet the cost of this scheme, the rates of postage were again increased in 1797.[61] A further increase was made in 1801 in order to-provide an additional contribution of £150,000 a year to the Exchequer.[62] The new rates were elaborate and complicated, comprising no less than thirteen rates for each class of letter, according to the distance of transmission. Another increase followed in 1805, when the Post Office was called upon to provide an additional £230,000 a year.[63] This time the increase was made in a very simple manner, viz. by increasing the rates of 1801 in every case by 1d. for a single letter, 2d. for a double letter, 3d. for a treble letter, and 4d. per ounce. All these increases, made with the avowed intention of increasing revenue, were successful in their main object. The net revenue, which in 1796 was £466,457, had risen in 1804 to £956,212, and in 1806 reached the sum of £1,119,429. The fiscal results seemed, therefore, to justify the Government in turning again and again to the Post Office when they were hard pushed to find revenue. This must be the justification of the further increase of 1812.[64] The rates then established were the highest ever charged in England. The net revenue rose slightly after their establishment, but never increased materially. These rates continued in operation until 1839, when they were completely swept away, and new rates based on principles fundamentally different were established. This was the system, due to Sir Rowland Hill, of uniform rates, irrespective of distance of transmission, first introduced in the United Kingdom in 1839, and since adopted throughout the civilized world, not only for inland services, but for the international service.[65] The story of the conception, advocacy, and adoption of uniform postage is fully told by Sir Rowland Hill in his _History of Penny Postage_,[66] and need be only briefly dealt with here. The plan itself is described in the famous pamphlet, _Post Office Reform: Its Importance and Practicability_, which was issued by Sir Rowland Hill in 1837.