ELEMENTS

OF

AGRICULTURAL CHEMISTRY,

&c.

ELEMENTS

OF

AGRICULTURAL

CHEMISTRY AND GEOLOGY.

BY

JAMES F. W. JOHNSTON, M. A., F.R.S.,

HONORARY MEMBER OF THE ROYAL ENGLISH AGRICULTURAL SOCIETY,
AND AUTHOR OF "LECTURES ON AGRICULTURAL

CHEMISTRY AND GEOLOGY."

WILLIAM BLACKWOOD AND SONS,

EDINBURGH AND LONDON.

MDCCCXLII.

472..