iv. Contents. 



Page. 



The Isthmus of Tehuantepec, Mexico, by Theron Skeel, 

 C. E., 156 



On Certain New Phenomena in Chemistry, by Verplanck 

 Colvin, 172 



Report of the Second Class, in the Second Department (Bo- 

 tany), by Charles H. Peck, A. M., 186 



From Newton to Kirchoff, by Leroy C. Cooley, Ph. D., - 205 



Synopsis of New York Uncinulse, by Charles H. Peck, - 213 



Report on the Water Supply of Albany, - - - - 218 



Researches in the Theory and Calculus of Operations, by John 



Paterson, A. M., - - - 228 



Index, 339 



