IV CONTENTS. 



Page. 

 ZOOLOGY. 



Observations on the Proteus of North America, by Samuel 



L. Mitchell, M. D., 63 



Description of five species of Chiton, by D. W. Barnes, 



M.A., 69 



MATHEMATICS AND MECHANICS. 



Review of'' A Treatise of Mechanics, by Olinthus Grego- 

 ry, LL. D." 72 



On the Form of the Teeth of Cog-Wheels, by Eli W. Blake, 



A. M. 86 



New Algebraic Series, by Prof. J. Wallace, Columbia, S. C. 2/8 

 Second Memoir on Navigable Canals, by M. P. S. Girard, 



(Ann. de Chimie,) Translated by I. Doolittle, - - 286 

 On Crank Motion, by A. B. Quinby, - - - - 3l6 



PHYSICS, CHEMISTRY, &c. 



Essay on the Question, whether there be two Electric 



Fluids, or only one, by Robert Hare, M. D. - - 103 

 Description of a new Electrical Plate Machine, by R. Hare, 



M. D. 108 



Description of an improved Blowpipe by Alcohol, by R. 



Hare, M. D. 110 



Description of M. Perkins' New Steam-Engine, (Edinb. 



Philos. Journal, No. XVII.) Ill 



Remarks on the Chinese and Brilliant Fires, by James Cut- 

 bush, - - 118 



Cryophorus of Dr. Wollaston, (Editor,) - - - - 140 

 Remarks on the Patent Water-Burner, by Samuel Morey, 141 

 Analyses of the Pyroxene of Sparta, N. J. by Henry Sey- 



"bert, 145 



On the precession of the Equinoxes, - - - - 323 



Description of an Improved Rain Gage, by George Chilton, 326 

 Account of Mr. Perkins' method of applying his new meth- 

 od of generating steam to the boilers of ordinary steam 

 engines, (Edinb. Philos. Journ. No. XVIII.) - - 332 

 Notice of a Halo, by Thos. Kendall, - - ' - - 337 

 On the Theory of the action of nitrous gas in Eudiometry, 



by J. F. Dana, - - - - - - - 338 



On the cutting of Steel by soft iron, (Editor,) - - 342 



Results of the analysis of the principal brine springs in 



New York, by George Chilton, . - - - 344 



