CONTENTS OF VOLUME XXl. 



NUMBER I. 



Page. 

 Art. I. Principles of Geology, _-_--. i 

 II. On some of the Vegetable Materials from which Cordage, 

 Twine and Thread, are made; by James Mease, M. D., 

 M.A.P. S., &c. 27 



III. Experiments and Observations on Narcotine and Sulphate 



of Morphine ; by William Tully, M. D. Prof Mat. Med. 

 &c. in Yale College, 39 



IV. On certain new Bone Caves; by Marcel de Serres, Prof. 



of Geology, &c. at Montpelier, - - . - 56 



V. Apparatus for Potassium, &c. ; by L. D. Gale, M.D. Ass't 



to Prof Chem. in Coll. Phys. in New York, - - 60 

 VI. On Chloric Ether; by S.Guthrie, - - - . 64 

 VII. On Central Forces ; by Prof Theodore Strong, - 66 



VIII. -Notice of the V\esicating Principle of Cantharides ; by 



G. W. Carpenter, - - - - - - - 69 



IX. On the variable rapidity of action between water and hot 

 iron; by Walter K. Johnson, Prof Mech. and Nat. Phil. 

 in the Franklin Institute, Philadelphia, - - - 71 

 X. Electro-Magnetic Apparatus; by Benjamin F. Joslin, 



M.D., Prof of Nat. Phil, in Union College, - - 86 

 XI. Notice of the Vaporization of Mercury in the fumes of 

 Nitric Ether — also, of various chemical products ; by 



S. Guthrie, 90 



. XII. Geological Notices; by Lieut. W.W.Mather, of the 



Mil. Acad. West Point, 94 



XIII. On North American Spiders ; by N. M. Hentz, late Prof. 



in the Univ. of N. Car. 99 



XIV. On the Unicorn ; by J. F. Laterrade, of Bordeaux. 



Translated by Jacob Porter, - - - - - 123 

 XV. Physical Geography ; translated from the Bib. Univ., by 



Prof Griscom, - - - - - - - 127 



XVI. Geological Equivalents; by Prof Amos Eaton, - - 132 



XVII. On the Application of Galvanic Ignition in Rock Blast- 



ing; by Robert Hare, M. D,, Prof Chem. Univ. Penn. 139 

 XVIII. Account of the Hudson and Mohawk Rail Road; by S. 



DeWitt Bloodgood, Cor. Sec. Albany Ins. - - 141 



MISCELLANIES. FOREIGN AND DOMESTIC. 



CHEMISTRY. 



1,2. Chloride of lime; disinfection of dead bodies — Cement for 



uniting fragments of vessels and other objects, - - 149 



