Proceedings of the Boston Society of Natural History. 
Vol. 29, No. 13, 
pp. 241-272. 
THE EMBRYONIC HISTORY OF IMAGINAL DISCS IN MELOPIIAGUS 
OVINUS L., TOGETHER WITH AN ACCOUNT OF THE 
EARLIER STAGES IN THE DEVELOPMENT 
OF THE INSECT. 
By II. S. Pratt., Ph. D. 
’With seven plates. 
V 
BOSTON: 
PRINTED FOR THE SOCIETY. 
June, 1000. 
