Contents

13 April 1973
Vol 180, Issue 4082

About The Cover

Enlargements of the reverse sides of the Australian 5¢ and 20¢ coins, illustrationg the echidbna(Tachyglossus aculeatus, top) and the platypus (Ornithorhynchus anatinus, bottom). The milk of these egg-laying mammals contains unusual caaarbohydrates. See page 210.[Jutta Hösel, Melbourne, Australia]