CONTENTS. v V 



XII. Notes on some Chenopo liacese, growing spontaneously, 



XIII. Analysis of the Braunau Meteoric Iron ; by Dr. N. W. 



Fischer, 



XIV. On the Acid Springs and Gypsum Deposits of the Onon- 



XV. On the Fundamental Principles of Mathematics ; by Pro- 

 fessor Stephen Alexander, ------ 



XVI. Notes on the Geology of Charleston, S. C. ; by F. S. 



Holmes, 



XVII. Description of two Reptiles from Oregon ; by Mr. Avery J. 

 Skilton, (With a plate.) 



XVIII. Range of the Gutta Taban Collectors, and present amount 

 of Imports into Singapore, --.-.- 



XIX, Application of the Galvanic Circuit to an Astronomical 

 Clock and Telegraph Register in determining local differ- 

 ences of longitude, and in astronomical observations gen- 

 erally, in a communication by Sears C. Walker, Assistant 

 U. S. C. S., addressed to Prof. A. D. Bache, LL.D., Supt. 

 U. S. Coast Survey, -.--... 



XX, Parallelism of the Palaeozoic Formations of North America, 

 with those of Europe j by Ed. de Vernkuil, translated, 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics, 



Page. 



about the City of New York ; by John Carey, - - 167 



171 



daga Salt Group; by T. S. Hunt, 175 



178 



187 



202 



203 



206 



232 



233 



with annotations, by James Hall, 218 



XXI. General Rule for Involution and Evolution by Logarithms ; 



by Prof. J. L. Riddell, M.D., 



XXII. Abstract of a Series of Experiments on Diamagnetism ; by 



H. C. CErsted, - - - - - - 



XXIII. Abstract of a Meteorological Journal, kept at Marietta, 



Ohio, by S. P. Hildreth, M.D., 



XXIV. On a new Protractor for Trisecting Angles ; by J. H. 

 Alexander, Esq., 



XXV. Notes on Upper California; by James D. Dana, - - 247 

 XXVL Some remarks on the Navicula Spencerii, and on a still 



more difficult test object ; by J. W. Bailey, - - - 265 



240 



213 



Oiamagn 



Prof. Plucker. 270.— On the Anion of the Red, Orange and Yellow Rays 

 upon Iodized and Bromo-iodized Silver Plates, after they have been affected by 



daylight, and other Phenomena of Photography, by M. Claudet : On the In- 

 fluence of Light in preventing Chemical Action, by Mr. R. Hunt, 272. An 



Examination of Berkeley's Theory of Vision, by Sir D. Brewster, 273. On 



the Peculiar Cooling Effects of Hydrogen and its Compounds in Cases of Voltaic 

 Ignition, by W. R. Grove, Esq., 274.— Report on Coloring Matters, by Dr. E. 



