like those so numerous in summer on the surface of our stagnant pools -- (See note T also.) In the morn- ing the net in skimming the sur- face of the water became rust color- ed from the orders floating orders, which seemed to be in great quantity. This is perhaps the deposition on the water of the African dust, particu- larly as indications of organic mat- ter, in a hard state were evident under the microscope. But microscopic a stelar alga was seen -- o o. Monday, July 25. N.Lat. 19°16' W.Long. 21°38' In the afternoon one or two large whales sported near us. The ejection has rather the appearance of a jet of steam rather than of water except that it vanishes instead of floating off into the air as a cloud -- which evanescence results from the approx- imation of temperatures of the two fluids -- the expired air and that within. Tuesday, July 26. N.Lat. 18°00' W.Long. 21°58' 1853 The water today is again green. Wednesday, July 27 N.Lat. 16°45' W.Long. 21°57' The flying fish are gradually becoming more numerous. Today the shoals were nu- merous and the fish of large size. Thursday, July 28. N.Lat. 15°08' W.Long. 22°46' At 12 o'clock we made land, which prov- ed to be the island of Maio. We af- terward made St Jago, and at sunset anchored in the Harbor of Porto Praga. Friday, July 29 Porto Praga At 8 o'clock I took the 1st Dinghy & crew and dredged in different parts of the Harbor until 8 o'clk. The bottom near the town was sand, depths ten, sometimes only five, fathoms, yielding Nacula and other bivolves, and a few univalves. In the outer parts of the harbor the water was deeper and the bottom consisted of small pebbles and multitudes of mullipores. By dredging I obtained shells of the Genera Turritella, Conchium, Patella Jesus, Pannumobia, Natica, Venus, Trux