Nature

A WEEKLY

ILLUSTRATED JOURNAL OF SCIENCE

A WEEKLY

ILLUSTRATED JOURNAL OF SCIENCE

VOLUME XXXVI

MAY 1887 to OCTOBER 1887

"To the solid ground

Of Nature trusts the mind which builds for aye.”—WORDSWORTH

London and New York
MACMILLAN AND CO.

1887

RICHARD CLAY AND SONS,

LONDON AND BUNGAY.