' Changing Seasons and Their
Influence'
JAMES RITCHIE , D.Sc.
(Regius Prof. of Natural History in the University of Aberdeen)
Professor Ritchie is a Scots graduate of Aberdeen University. Now in his fifties, he is one of the greatest authorities on Natural History in Britain. He has written several invaluable books and papers and, with his wife, translated Boule's ' Hommes fossiles'. The distinguished posts he has held in the past include that of Keeper of the Royal Scottish Museum; Secretary of the Royal Physical Society ; and that of Secretary of the Royal Society of Edinburgh.
This is Professor Ritchie's third talk in the series dealing with animal and plant life.