Pelicans A154 - Microbes by the Million

TO DAUGHTER BARBARA

who became “ Penguin ”-conscious at a very early age

First Published June 1939 Second Edition (with some changes and new matter) June 1940 Third Edition (revised) 1945

Made and printed in Great Britain for Penguin Books, Ltd., by Hazell, Watson and Viney, Ltd., London and Aylesbury