CONTENTS. v 
NOMBER LITII. 
Page. 
Arr. XXI. On the comparative Expenditure of Heat in different 
forms of the Air-Engine; by Prof. Frepericx A. P. Barnarp, 161 
XXII. On the first Hurricane of September 1853, in the At- 
lantic ; with a Chart; and Notices of other Storms: ~ 
W.C. REDFIELD, - 176 
XXUHI. Researches upon Richiiéieuat and Retaackocion Hy. 
drogen, and their relations to ere “ Professor 
RapwaeEt Napotl, - - - 190 
XXIV. On some of the Cryin eee ee of North f ome ; 
by T.S. Hunt, - - - 193 
XXV. Documentary Publications dad etche in ihe Cat Sur- 
vey Report for 1853, _—- - 200 
XXVI. On the use of Hydrogen Gas and terceke Acid Gas, to 
displace Sulphuretted Hydrogen in the analysis of Mineral 
Waters, &c. ; by Prof. W. B. Roczrs and Prof. R. E. Rocers, 2138 
XXVII. On Changes of the Sea-Level effected by existing Phys- 
ical Causes during stated ear of time; Bd ALFRED 
Tytor, F.G.8.,°  - : 216 
~ XXVIII. On Fuchs’s method for as loon sh a Tio 
by J. R. Brant, - - - 227 
XXIX. On Stibiotrizincyle and Stibiobizineyle; two new com- 
~ pounds of Zinc and Antimony, with some remarks on the 
deconiposition of water by the ie of these metals; y 
Josian P. Cooxe, Jr, - - 229 
XXX. On the Nature of Forces; by aout BI B. Hont, - + 237 
XXXI. Contributions to Mineralogy ; by James D. Dana, - - 249 
XII. Notice of the Life and Writings of the late Dr. Waldo 
Irving Burnett ; by Jerrries Wyman, M.D.,_ - - = oe 
SCIENTIFIC INTELLIGENCE, 
aes Chemistry and Physics.—On the continuity and — = we eurrent of the magneto-elec- 

__ trie machine, 264.—Galvanic reduction of 266.—On_ the losses of 
_ Weight which minerals undergo by heat: Ilustrations of poe omolog 
ue Mineralogy and Geology.—Notice of von Kobell’s 5 Dope. os age of Isomorphous and 
. the Chloritoid of 

_ On the Alteration of Scapolite, by G.v. Ratu, , 272.—Report on the Salt and Gypsum 
of the Preston Salt Valley of the Holston River, Virginia, by ‘Prof. H. D, Rogers, 273, 
—The Metallic Wealth of the United States described and compared with that of 
other Countries, by J. D. Wartney, 274.—City of San Salvador destroyed by an Earth- 
quake, 277. 
