Rough Ways Made Smooth: A series of familiar essays on scientific subjects

ROUGH WAYS MADE SMOOTH
A SERIES OF
Familiar Essays on Scientific Subjects
RICHARD A. PROCTOR
NEW IMPRESSION
LONGMANS, GREEN, AND CO.
39 PATERNOSTER ROW, LONDON NEW YORK AND BOMBAY
1903
All rights reserved
' Let knowledge grow from more to more ' Tennyson
PREFACE.
It is scarcely necessary for me to explain the plan of the present work, because I have already—in introducing my 'Light Science for Leisure Hours,' my 'Science Byways,' and my 'Pleasant Ways in Science'—described the method on which, as I think, such treatises as the present should be written. This work deals with similar subjects in a similar way; but I think the experience I have acquired in writing other works on the same plan has enabled me to avoid some defects in the present work which I have recognised in the others.