iv Contents. 



Mr. Otto Meske's Collection of Lepidoptera, by Mr. J. A. 



Lintner, 215 



Thoughts on Causality; with Rerences to Phases of Recent 

 Science, by Alexander Winchell, LL.D., - - - 221 



Portable Boats, by Verplanck Colvin, 25 



The Mohawk and Hudson River Railroad, by Joel Munsell, 267 

 The Black Spruce, by Charles H. Peck, A.M., - - - 283 



Errata, 302 



Index, 303 



