... sea, with no more cargo than a few days' coal, would not average more than four knots and a half an hour. I ascertained, after her arrival here, that the unloading of her cargo, taking on coal for Halifax , and some repairs, would detain her until about the 15th of March, and that the British mail steamer for Halifax would leave here on Friday, the 18th. I thought that as under the most favorable cir...