I returned from Greytown and the waters of the San Juan to St. Thomas, spending a few days at Aspinwall and Panama on my journey, as I have before explained; and on this occasion, that of my fourth visit to St. Thomas, I was happy enough to escape without any long stay there. My course now lay to the Bermudas, to which islands a steamer runs once a month from that disagreeable little depot of steam navigation. But as this boat is fitted to certain arrivals and despatches, not at St. Thomas...