



An Essay on the Development of the Mouth 

 Parts of Certain hisects. 



By JOHN B; SMITH, ScD. . ,~ ^ ^^ 



Read before the American Philosophical Society, February 21, I896. 



Reprinted, November lo. iS'/., irmii Tninsaclions i>f Amer. Philos. Sue. Vol. xix. 



DEC 1 1987 



