The
Bacillus of Long Life

A Manual of the Preparation and Souring of Milk for
Dietary Purposes, Together with an Historical
Account of the Use of Fermented Milks, from
the Earliest Times to the Present Day,
and Their Wonderful Effect in the
Prolonging of Human Existence

By

Loudon M. Douglas, F.R.S.E.

With 62 Illustrations

G. P. Putnam's Sons
New York and London
The Knickerbocker Press
1911

Revised Edition

Copyright, 1911
BY
G. P. PUTNAM'S SONS

The Knickerbocker Press, New York

PREFACE

This book has been designed with a view to meet an extensive demand for definite data on the subject of Soured Milks. The author has had this matter brought before him, times without number, by those inquiring for authentic information on the subject, and he has therefore considered it desirable to gather together such information as is available in connection with ancient and modern practice. He has endeavoured to present this to the reader in concise form.

The author is indebted to many friends for their assistance in getting the book together, and would specially mention Dr. H. B. Hutchinson, Bacteriologist, Rothamsted Experimental Station, for assistance in connection with the bacteriology of fermented milks; Mr. Thomas Douglas, of Wimbledon, who has assisted with the chemistry of the subject; Mr. S. Javrilovitch, of Belgrade, Servia, for local information and illustrations; Dr. Otokar Laxa, Bacteriologist, of Prague, Bohemia, for general assistance; the editor of Bacteriotherapy, New York, U.S.A., for the use of the group of illustrations 30-44; the publishers of the Centralblatt für Bakteriologie, Jena, for the group of illustrations 14-29; and many others, some of whom are referred to in the text.

CONTENTS

ILLUSTRATIONS