CONTENTS. 



An Epitome of the progress of Natural Science, .... 49 



Tour to the Caves in "Virginia, -- 58 



New Metal, proviaonally called Vanadium, and Professor Del Rio'3 Letter, 67 

 ExRpriment with Flowers, ... .... 71 



Anthracite Coal applied to generate Steam Power, - - - - 72 



Description of the Jaws, Teeth and Clavicle of the Megalonyx laqueatus, 74 



The United States exempt from deserts, -76 



Communication from a writer on Geology in the North American Review, 82 

 N. K. System of Arrangement, - - - - ... 92 



A case where the Specimens required no locality, - - - - 92 



Preparations to receive a Royal Naturalist, - - - - - 92 



Anecdote of a conflict between a Fire Fly and Spider, - - - 93 

 Case of a Bee, self decapitated, - - - - - - 94 



Anecdote of a decapitated Rattle Snake. - - - .94 



Extract from the Journal of a Naturalist, - - - .95 



To Readers and Correspondents, - - . - - 96 



Entered according to the Act of Congress, in the year one thousand eight 

 hundred and thirty-one, by Henry H. Porter, in the Clerk's Office of the 

 District Court of the United States, in and for the Eastern District of Penn. 

 sylvania. 



