By an act passed in 1827 it was provided that henceforth all rates for letters conveyed within Ireland should be collected in British currency. The rates themselves and the distances remained the same as had been provided by the act of 1814. The postage collected on letters between the two kingdoms was henceforth to be retained in the country where it was collected. The rates for letters passing between the two kingdoms were assimilated with the rates prescribed for Great Britain by the act of 1812. In addition to the land rates, 2d. was required for the sea passage to and from Holyhead and Milford and to this 2_d._ more was added for the use of the Conway and Menai Bridges.[613] Between Portpatrick and Donaghadee the postage was 4_d._ for a single letter, between Liverpool and any Irish port 8_d._, but no letter sent via Liverpool paid a higher rate than if sent via Holyhead.[614] An additional halfpenny was also demanded on every single letter passing between Milford Haven and Waterford, to pay for improvements.[615] [613] 7 and 8 Geo. IV, c. 21. The postage between Liverpool and Dublin for a single letter was 13_d._, made up as follows:-- Inland postage to Holyhead 9_d._ For the Conway Bridge 1_d._ " " Menai " 1_d._ Sea postage 2_d._ ----- 13_d._ In 1820, the sea rate between Portpatrick and Donaghadee had been raised by 2_d._ for a single letter, between Liverpool and the Port of Douglas by 4_d._ (1 Geo. IV, c. 89; 3 Geo. IV, c. 105). [614] 7 and 8 Geo. IV, c. 21; 1 and 2 Geo. IV, c. 35, secs. 19-20; 6 Geo. IV, c. 28. [615] 6 and 7 Wm. IV, c. 5. In 1836, England and France signed a postal treaty by which the rates on letters between the United Kingdom and France or between any other country and the United Kingdom through France were materially reduced.[616] On such letters the method of reckoning postage differed from the English rule and was as follows: One sheet of paper not exceeding an ounce in weight and every letter not exceeding one quarter of an ounce were single letters. Every letter with one enclosure only and not exceeding an ounce in weight was a double letter. Every letter containing more than one enclosure and not exceeding half an ounce was a double letter. If it exceeded half an ounce but not an ounce in weight, it was a triple letter. If it exceeded an ounce, it paid as four single letters and for every quarter of an ounce above one ounce it paid an additional single letter rate.[617] The sender of a letter from Great Britain to France had the option of prepaying the whole postage, British and foreign, or the British alone, or neither.[618] [616] _Acc. & P._, 1837, l. 106. Rates on foreign letters before, and after the French treaty:-- _Between England and_ _Before_ _After_