The next morning, while Tourville was engaged in taking his sights for the longitude and working them out, he suddenly complained of feeling ill, sent for Leroy, gave him certain instructions, and then took to his bed.  By noon it became evident that he was in for a smart attack of malarial fever, to which it appeared he was very subject; and when I turned in that night the mate volunteered the information that he feared the skipper was going to be very ill.