MINUTE STRUCTURE 



OF THE 



CENTRAL NERVOUS SYSTEM 



OF CERTAIN 



REPTILES AN DBATRACHIANS 



OF 



AMERICA. 



ILLUSTRATED BY PERMANENT PHOTO-MICROGRAPHS. 



BY 



JOHN J. MASON, M. D. 



SERIES A. 



AUTHOR'S EDITION. ONE HUNDRED. 



NEWPORT: 1879-1882. 



