THE

INFLUENCE

OF

TROPICAL CLIMATES,

MORE ESPECIALLY

The Climate of India,

ON

EUROPEAN CONSTITUTIONS;

THE

PRINCIPAL EFFECTS AND DISEASES

THEREBY INDUCED,

THEIR PREVENTION OR REMOVAL,

AND

THE MEANS OF PRESERVING HEALTH

In Hot Climates,

RENDERED OBVIOUS TO EUROPEANS OF EVERY CAPACITY.

AN ESSAY.

BY JAMES JOHNSON, Esq.

SURGEON IN THE ROYAL NAVY.

PRINTED FOR J. CALLOW, MEDICAL BOOKSELLER,

10, Crown Court, Princes Street, Soho.

SMITH and DAVY, Printers, 17, Queen Street, Seven Dials.

TO

DR. JOHN HARNESS, F. L. S.

ONE OF HIS MAJESTY'S COMMISSIONERS
OF TRANSPORTS, SICK AND

WOUNDED SEAMEN,

&c. &c. &c.

SIR,

I BELIEVE You will not suspect me of any interested motive in the present Address, since you well know, how rarely I have mingled with the importunate host -"who crowd Preferment's gate."

But, Sir, I can still remember, after a lapse of many years, the flattering manner in which you conferred on me my First Step of Promotion in His Majesty's Service, when I was very young, both in years