Translation of a letter, from Charles Nicholas Languis to Hans Sloane, dated at Lucern Concerning an agate (streaked chalcedony), which has a representation of Christ on it, and he encloses a printed copy of his account of it; wishes to send a catalogue of his works and discusses his small work on flints and pebbles from rivers and that he is correcting and enlarging his classification of shells Original letter was in Latin and 14 February 1736 1736