MEMBER OF THE NATIONAL INSTITUTE OF FRANCE, AND OF THE ROYAL
ACADEMY OF NAPLES;

AND

E. J. ROUTH, B.A.

FELLOW OF ST. PETER'S COLLEGE, CAMBRIDGE.

LONDON:

LONGMAN, BROWN, GREEN, AND LONGMANS; C. KNIGHT
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ΤΟ

PROFESSOR THE BARON PLANA,

OF TURIN,

THIS WORK IS INSCRIBED,

AS A SMALL TOKEN OF RESPECT FOR THE GREAT TALENTS AND

PROFOUND LEARNING OF THAT EMINENT

MATHEMATICIAN.