HESSIAN FLY, 
HISTORY, CHARACTER, TRANSFORMATIONS, 
AND HABITS. 
BY ASA FITCH, M.D. 
ORIGINALLY PUBLISHED IN THE AMERICAN JOURNAL OF 
AGRICULTURE AND SCIENCE, VOLS. IV., V. 
$$ LLLP 
ALBANY: 
PRINTED BY JOEL MUNSELL. 
1846, 
