1. Gratton, R., private communication, August, 1985. We are grateful to Dr. Richard Gratton (Rolland Inc., Mont-Rolland, Quebec) for lending us the Mauritius, Hungary, and Monaco stamps for photography and also for copies of philatelic articles he wrote on biochemistry and chemistry in Philatélie Québec, and in La Philatélie au Québec.
2. Scient. Amer., 1978, 239, Nov., pp. 90–91.