A chart of the Indian Ocean showing the declinations of the compass from George Louis Leclerc Buffon's 'Histoire Naturelle, Generale et Particulaire' 1749-04. This map appears in the Minereaux volume of 1788. It shows the waters from South Africa to Borneo including Arabia, Indian and South East Asia. The measurements are the work of La Perouse during his fateful voyage supplemented by those of the eminent scientist Jean-Charles Borda.