Some few typographical and other errors have occurred in the progress of the volume, which we are anxious to correct.

In page 210, line 13, for “old transparent,” read “cool transparent.”

In page 223, line 3, for “carbonate of zinc,” read “carbonate and sulphuret of zinc.”

In page 251, line 4, for “Procapella de Coton,” read “Pro capella de Coten.”

In the List of Illustrations, for “Corn Market,” read “Cross Market.”