CONTENTS OF VOLUME XXIV 



NUMBER LXX. 



Art. I. On the General Distribution of Terrestrial Magnetisni in 

 the United Stales, from observations made in the U. S. Coast 

 Survey and others; by A. D. Bj\che, Superintendent, and J. 



i 



E, HiLGARD, Assistant U, S, Coast Survey. With two maps, 1 



^ ' II. On the Cyclones or Typhoons of the North Pacific Ocean ; 



z 



^ 



/ 



11^ e 



with a Chart, sliovving iheir Courses of Progression ; by W. 



z C. Redfield. With a Plate, 



IIL Reply to Dr. F. A. Genth'*s remarl^s on the Minerals of the 



IV. On a Modified form of Ruhmkorff's Induction Apparatus ; 



by E. S. Ritchie, 



by F, A. Genth, 



XL Notice of a Meteoric Stone which fell at Petersburg, Lincoln 

 couniy, Tennessee, August 5lh, 1855; by Charles Upham 



Shepard, 



XII. On the Separation of Magnesia and Lithia ; by J- W, 



Mallet, Ph.D., 



21 



Canton Mine ; by Charles Upham Shepard, - - - 38 



45 



V. Caricography ; by Prof. C. Dewey, 46 



VI. The Self-sustaining power of the Gyroscope analytically ex- 

 amined ; by Maj. J. G. Barnard, A. M., Corps of Engineers, 



U. S. A., . - 49 



VII. Observations upon the Cretaceous Strata of the United 

 States with reference to the Relative Position of Fossils col- 

 lected by the Boundary Commission ; by James Hall, - 72 



Vlir. Researches on the Ammonia-cobalt Bases; by Wolcott 



GiBBS and F. A. Genth. — Part I — (concIud(;d), - . 86 



IX. Fourth Supplement to Dana's Mineralogy ; by the Author, 107 



X. A few remarks in answer to Prof. C. U. Shepard's " Reply ;" 



133 



134 



137 



1 



1 



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