IR WILLIAM THOMSON, LL.D., F.R.S., F.R.S.E., &c.

PROFESSOR OF NATURAL PHILOSOPHY IN THE UNIVERSITY OF GLASGOW, AND
FELLOW OF ST. PETER'S COLLEGE, CAMBRIDGE.

IN THREE VOLUMES

VOL. I.

CONSTITUTION OF MATTER

WITH ILLUSTRATIONS

London:

MACMILLAN AND CO.

AND NEW YORK

1889