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Transcriber’s note: Table of Contents added by Transcriber.
CONTENTS
Preventive Inoculation115
Professor Ewart's Penycuik Experiments126
Colonies and the Mother Country139
The Future of the Negro in the Southern States147
The Physical Geography of the Lands157
The New York Botanical Garden171
Gas and Gas Meters179
The Sun's Destination191
A Biographical Sketch of an Infant197
Correspondence206
Scientific Literature213
The Progress of Science219
THE
POPULAR SCIENCE
MONTHLY
EDITED BY
J. McKEEN CATTELL
VOL. LVII
MAY TO OCTOBER, 1900
NEW YORK AND LONDON
McCLURE, PHILLIPS AND COMPANY
1900
Copyright, 1900,
By McCLURE, PHILLIPS AND COMPANY.
PROFESSOR WOLCOTT GIBBS,
President of the National Academy of Sciences, Emeritus  Rumford Professor and Lecturer on the Applications of  Science to the Useful Arts at Harvard University.
115
THE
POPULAR SCIENCE
MONTHLY.
JUNE, 1900.
PREVENTIVE INOCULATION. (I.)
By Dr. W. M. HAFFKINE.
DIRECTOR-IN-CHIEF, GOVERNMENT PLAGUE RESEARCH LABORATORY, BOMBAY.
It was due to certain particularly favorable circumstances that thefirst ideas on preventive inoculation were gathered from observationson smallpox patients. Such circumstances were presumably thefollowing:
a. It is a disease which attacks epidemically, in a short time andwithin a small area, large numbers of people, thus permitting ofeasy comparisons and suggesting conclusions from the facts observed.
b. Its fatality is comparatively small, so that after each outbreak alarge number of co                        
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