vi
In preparing the illustrations, no pains have been spared to make them as complete as the extent of analysis, and the size of the plate adopted, would allow.
The drawings were made, under my immediate supervision, by Mr. August Schrader, a draughtsman of rare merit. They were engraved on copper by Mr. William Dougal, equally distinguished in his art.
W S. SULLIVANT.
Columbus, Ohio.
