A discourse, intended to commemorate the discovery of America by Christopher Columbus : delivered at the request of the Historical Society in Massachusetts, on the 23d day of October, 1792, being the completion of the third century since that memorable event. : To which are added, four dissertations, connected with various parts of the discourse, viz. 1. On the circumnavigation of Africa by the ancients. 2. An examination of the pretentions of Martin Behaim to a discovery of America prior to that of Columbus, with a chronological detail of all the discoveries made in the 15th century. 3. On the question, whether the honey-bee is a native of America? 4. On the colour of the native Americans and the recent population of this continent. /