CONTENTS. V 



NUMBER Ti. 



Page. 



Art. I. Observations upon certain Ai ' ancfOptical Phenom- 

 ena; by Alexander C. TwixSfiNG, _ . _ 217 

 II. Geological and Mineralogical Notices ; by Prof. Oliver 



P. Hubbard, M. D. - - - - - - 230 



III. On the Economical Uses of some species of Testacea, 235 



IV. Criticisms and suggestions respecting Nomenclature; by 



Prof. Robert Hare, M. D. Also, a Letter from the 

 celebrated J. J. Berzelixjs, - . . . 259 



V. Description of an Electrical Machine, with a Plate four 

 feet in diameter, so constructed as to be above the Ope- 

 rator : also, of a Battery Discharger employed there- 

 with : and some Observations on the Causes of the Di- 

 versity in the Length of the Sparks erroneously distin- 

 guished by the terms Positive and Negative ; by Prof. 



R. Hare, M. D. &c. - 273 



VI. Of an Improved Barometer Gage Eudiometer ; by Prof. 



R. Hare, M. D. &c. 280 



TIL Engraving and Description of Voltaic Series, combining 

 the advantages of the trough of Cruickshank with tho«e 

 of the Deflagrator ; by Prof R. Hare, M. D. &c. 285 



VIIL A Natural System of Botany ; or a systematic view of 

 the Organization, Natural Affinities, and Geographical 

 Distribution of the whole Vegetable Kingdom ; together 

 with the uses of the most important species in Medi- 

 cine, the Arts, and rural or domestic economy; by 



John Lindley, Ph. D. &c. 292 



IX. Electro-Meteorological Observations ; by Jas. Swaim, 304 

 X. Experiments upon the Induction of Metallic Coils ; hy 



John B. Zabriskie, M. D. . , . . . 308 



XL Description of the model of an Electro-Magnetic Engine, 



constructed by John B. Zabriskie, M. D. - - 313 

 XII. On Zinc Roofing ; by Prof. L. D. Gale, - - 315 



XIII. On the Common Blowpipe ; by Prof. J. W. Bailei*, 319 



XIV. Notice of the Gold Veins of the United States' Mine near 



Fredericksburg, Va. ; by Lieut. M. F. Maury, U. S. N. 325 

 XV. Chronometers, -.--... 330 

 XVI. Chemical Examination of Microlite ; by Prof. Charles 



Upham Shepard, M. D. 338 



XVIL Notice of Eremite, a new Mineral Species ; by Prof. 



Charles U. Shepard, iM.D. . . . . 344 



