ON THE

ELEMENTS OF COMPARATIVE ANATOMY.

BY

THOMAS HENRY HUXLEY, F.R.S.,

PROFESSOR OF NATURAL HISTORY, ROYAL SCHOOL OF MINES; AND PROFESSOR OF COMPARATIVE ANATOMY AND
PHYSIOLOGY TO THE ROYAL COLLEGE OF SURGEONS OF ENGLAND.

ON THE CLASSIFICATION OF ANIMALS

AND

ON THE VERTEBRATE SKULL.

LONDON:

JOHN CHURCHILL AND SONS, NEW BURLINGTON STREET.

MDCCCLXIV.

LONDON: PRINTED BY WILLIAM CLOWES AND SONS, STAMFORD STREET

AND CHARING CROSS.

DEDICATION.

To GEORGE BUSK, Esq., F.R.S.

MY DEAR BUsk,

I BEG leave to dedicate these Lectures of mine to you, partly as my old and staunch friend, and partly as a member of the Council of the Royal College of Surgeons, and therefore a representative of the body to which I am indebted for the opportunity of delivering them.

Ever

Yours very faithfully,

T. H. HUXLEY.

THE ROYAL SCHOOL OF MINES, JERMYN STREET.

March 7th, 1864.