SCIENTIFIC TRACTS, 



DESIGNED FOR 



INSTRUCTION AND ENTERTAINMENT, 



AND ADAPTED TO 



SCHOOLS, LYCEUMS, AND FAMILIES. 



CONDUCTED BY 



JOSIAH HOLBROOK, AND OTHERS. 



VOL. I. 



BOSTON. 

 PUBLISHED BY CARTER, HENDEE, AND BABCOCK. 



Corner of Washington and School Streets. 



1831. 



