ON THE

Barrenness

OF

FRUIT TREES,

AND THE MEANS OF

PREVENTION AND CURE.

By P. LYON.

Colere Deos, Colere Agros.

By the sweat of thy brow, shalt thou earn thy food."

EDINBURGH:

PRINTED BY C. STEWART,

FOR WILLIAM BLACKWOOD, SOUTH BRIDGE STREET ;

AND ROBERT BALDWIN, PATERNOSTER ROW,