The following will be the periods of the steamers between Halifax (p. 122) and Havannah, from which it will appear how well the whole will work as regards all North America and all the West Indies; and also how regularly and pointedly the return steamer from the Havannah (bringing the Havannah and Tampico mails, should any accident have happened to the Jamaica steamer), will call at New York for the replies to the letters by the packet from Europe, arrived at that city two days before her; and carry these forward to Halifax (giving two days to stop at New York) in time to get the steamer with the homeward British mails from that place to Fayal. _Arrivals and Departures of the London Mails of the following dates_. Mail of Arrive at Leave Arrive at Return to Havannah Halifax Havannah Halifax -----------\-------------\------------\-------------\-------------\ January 1 January 31 January 20 January 30 February 13 15 February 15 February 4 February 14 28 February 1 March 3 20 March 2 March 16 15 18 March 7 17 April 1 March 1 31 20 30 13 15 April 15 April 4 April 14 28 April 1 May 1 20 30 May 13 15 16 May 5 May 16 29 May 1 31 20 30 June 13 15 June 15 June 4 June 14 28 June 1 July 1 20 30 July 14 15 16 July 5 July 15 29 July 1 31 20 30 August 13 15 August 15 August 4 August 14 28 August 1 31 20 30 September 13 15 September 15 September 4 September 14 28 September 1 October 1 20 30 October 14 15 16 October 5 October 15 29 October 1 31 20 30 November 13 15 November 15 November 4 November 14 28 November 1 December 1 20 30 December 14 15 16 December 5 December 15 29 December 1 31 20 30 January 13 15 January 15 January 4 January 14 28 Sailing packets in these stations would depart and arrive at corresponding periods, being able to be, if any thing, earlier forward to Fayal; but always 15 days more on their respective voyages than the steam-boats.