BOYS AISTD GIRLS 



IN 



BIOLOGY; 



OR, 



SIMPLE STUDIES OF THE LOWER FORMS OF LIFE, 



BASED UPON THE 



LA TEST LECTURES OF PROF. T. H. HUXLEY, 



AND PUBLISHED BY HIS PERMISSION, 



BY 



J 



SARAH HACKETT STEVENSON. 



ILLUSTRATED BY MISS M. A. I. MACOMISH. 



NEW YORK: 

 D. APPLETON AND COMPANY, 



549 & 551 BROADWAY. 



1875. 



