CONTENTS. 
Agr. XV. Observations on the Contrast in the Physical Features 
and Resources between the Old World and the New World; 
by Prof. Arnoup Guyot, - 
XVI. On the relation of the Laws of Mechittice + to Penpetol 
Motion; by Jeremtan Day, - : 
XVII. Contributions to the Mycology of North Aine: by 
Rev, M. J. Berxezey, of Be ipsa and Rev. M. es Curtis, 
of South Carolina, - : 
XVIII. Experimental Résonrciee in Electricity: =n -third 
Seri eries ; : oy Micuary Fanapay, Esgq.; D:C.L.; ERS, ete, 
: ae aes Béticty of India, : 
On i Quantity. of Heat evolved from Kingophdle ’Air by 
Mecha nical Compression 5 by Joux Gora, M.Dy*+ . 
Noti of Reinga of: Vertebrate Animals fiyse at Rich: 
~M. 
age. 
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