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STUDIES ON FERMENTATION

STUDIES ON FERMENTATION
THE DISEASES OF BEER
THEIR CAUSES, AND THE MEANS OF PREVENTING THEM
BY
LOUIS PASTEUR
MEMBER OF INSTITUTE OF FRANCE, THE ROYAL SOCIETY OF LONDON, ETC.
A TRANSLATION, MADE WITH THE AUTHOR’S SANCTION, OF
“ÉTUDES SUR LA BIÈRE,” WITH NOTES, INDEX, AND ORIGINAL
ILLUSTRATIONS
BY
FRANK FAULKNER
AUTHOR OF “THE ART OF BREWING,” ETC.
AND
D. CONSTABLE ROBB, B.A.
LATE SCHOLAR OF WORCESTER COLL., OXFORD
London
MACMILLAN & CO
1879

PARDON AND SONS, PRINTERS, PATERNOSTER ROW, LONDON.

TO
THE MEMORY OF
MY FATHER,
FORMERLY A SOLDIER UNDER THE FIRST EMPIRE,
AND
KNIGHT OF THE LEGION OF HONOUR.
THE LONGER I LIVE, THE BETTER DO I UNDERSTAND THE KINDNESS OF
THY HEART AND THE EXCELLENCE OF THY MIND.
TO THY EXAMPLE AND COUNSELS DO I OWE THE EFFORTS THAT HAVE
BEEN DEVOTED TO THESE STUDIES, AS WELL AS TO ALL THE WORK
I HAVE EVER DONE. AND NOW, HOW CAN I BETTER HONOUR THESE
FILIAL REMEMBRANCES THAN BY DEDICATING MY BOOK TO THY MEMORY?
L. PASTEUR.
vii

AUTHOR’S PREFACE.

Our misfortunes inspired me with the idea of these researches.I undertook them immediately after the war of 1870, and havesince continued them without interruption, with the determinationof perfecting them, and thereby benefiting a branch ofindustry wherein we are undoubtedly surpassed by Germany.

I am convinced that I have found a precise, practical solutionof the arduous problem which I proposed to myself—that of aprocess of manufacture, independent of season and locality,which should obviate the necessity of having recourse to thecostly methods of cooling employed in existing processes, andat the same time secure the preservation of its products forany length of time.

These new studies are based on the same principles whichguided me in my researches on wine, vinegar, and the silkwormdisease—principles, the applications of which are practicallyunlimited. The etiology of contagious diseases may, perhaps,receive from them an unexpected light.

I need not hazard any prediction concerning the advantageslikely to accrue to the brewing industry from the adoption ofviiisuch a process of brewing as my study of the subject hasenabled me to devise, and

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