One boat would do all this work, giving two mails each month. At Sea each voyage 8 days = 16 monthly = 192 yearly. Coals 25 tons daily = 4,800 tons yearly, at 40_s._, 9,600_l._ Other charges, 6,820_l._--together 16,400_l._ 6. _Trincomalee to Calcutta._ A steamer would proceed from Trincomalee to Calcutta and back, calling in going and returning at Pondicherry and Madras. The route and time would be thus:-- Geo. Miles. Days. Trincomalee to Madras 300 1-1/2 Madras to Calcutta 735 3-1/2 Stop at Calcutta, Coals, &c. 2 Calcutta to Trincomalee, same route 1035 5 ---- -- Totals 2070 12 One steam-boat would perform this work, giving two mails each (p. 077) month; at sea each voyage 12 days[16] = 24 monthly = 288 yearly. Coals, 25 tons daily = 7200 tons yearly, at 40_s._, 14,400_l._ Other charges, 6820_l._--together 21,220_l._ per annum. [Footnote 16: The time here is only ten days; but the calculation was made for a different division of the mails, and it has not been thought necessary to alter it. The time in which the different distances may be run has been here stated, but the necessary arrangements for the arrivals and departures of the mails will, in some instances, extend that time. These arrangements resolve the periods into--say 45, 60, 75, 90, 105, 120, &c. &c. days. Thus, if the mails between Alexandria and Bombay cannot be back at Alexandria, as they really cannot be, within 30 days, the object to come up with the regular return Mediterranean mail for England is equally attained if it is back at Alexandria within 45 days; and the same principle applies equally to every other station.] From Trincomalee eastward to Batavia, Canton, and New South Wales, the routes, periods, distances, and expenses, would be exactly the same as those which have already been pointed out in the plan of having the communications by the Red Sea, under heads Nos. 7, 8, 9, and 10. Bringing the whole into one table, the total amount is ascertained, and the difference of expenditure in the one route over the other becomes distinctly known. In order, however, to bring the whole into a tabular form, it is necessary to recapitulate and particularize the different heads, thus:--