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90 difference in the sexes, either in size or color; they are sooty black above, and snowy white below. The exact measurements are in my memorandum-book. June 29. This morning we came up with the ship "Thalia," of Philadelphia, Captain John R. Butler, from Havana to Minorca up the Mediterranean, with many passengers, Spaniards, on board. The captain very politely offered us some fruit, which was gladly accepted, and in return we sent them a large Dolphin, they having caught none. I sent a Petrel, stuffed some days previously, as the captain asked for it for the Philadelphia Society of Sciences. June 30, Whilst sailing under a gentle breeze last night, the bird commonly called by seamen "Noddy" alighted on the boom of the vessel, and was very soon caught by the mate. It then uttered a rough cry, not unlike that of a young crow when taken from the nest. It bit severely and with quickly renewed movement of the bill, which, when it missed the object in view, snapped like that of our larger Flycatchers. I found it one of the same species that hovered over the seaweeds in company with the large Petrel. Having kept it alive during the night, when I took it in hand to draw it it was dull looking and silent. I know nothing of this bird more than what our sailors say, that it is a Noddy, and that they often alight on vessels in this latitude, particularly in the neighborhood of the Florida Keys. The bird was in beautiful plumage, but poor. The gullet was capable of great extension, the paunch was empty, the heart large for the bird, and the liver uncommonly so. A short time before the capture of the above bird, a vessel of war, a ship that we all supposed to be a South American Republican, or Columbian, came between us and the "Thalia," then distant from us about one and a half miles astern, fired a gun, and detained her for some time, the reason probably being that the passengers were