ELEMENTS 



OF 



NATURAL HISTORY: 



EMBRACING 



ZOOLOGY, BOTANY AND GEOLOGY; 



SCHOOLS, COLLEGES AND FAMILIES. 



BY 



W. S. W. RUSCHENBERGER, M.D., 



SURGEON, U. 8. NAVY; MEMBER OF THE AMERICAN PHILOSOPHICAL SOCIETY; OF THE ACADEMY 



OF NATURAL SCIENCES, PHILADELPHIA: OF THE AMERICAN ASSOCIATION FOB 



THE ADVANCEMENT OF SCIENCE; &C., iiC. 



IN TWO VOLUMES. 



WITH NEARLY ONE THOUSAND ILLUSTRATIONS, 

 AND A COPIOUS GLOSSARY. 



VOL. I. 



RTEBRATE ANIMALS, 



PHILADELPHIA: 

 CLAXTON, REMSEN & HAFFELFINGER, 



819 & 821 MARKET STREET, 

 1871. 



