VOLUME SIXTEEN

P. F. COLLIER & SON COMPANY

NEW YORK

Copyright 1922

BY P. F. COLLIER & SON COMPANY

MANUFACTURED IN U. S. A. HOW TO USE THE POPULAR SCIENCE LIBRARY

BY

GARRETT P. SERVISS

HISTORY OF SCIENCE

BY

ARTHUR SELWYN-BROWN

GENERAL INDEX

P. F. COLLIER & SON COMPANY NEW YORK

PREFACE

The final or Index volume of the Popular Science Library not only increases the value of this great set, but actually multiplies it.