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CONTENTS. 
NUMBER CXXxVIII. 
Art. XVI. On the Decrease of the Rate of Increase of Popu- 
lation now obtaining in res and America ; a Horatio 
Ropinson STORER, f * 
XVII. Research on the Ethers of Silicic Acid; sy C. FRiEpEL 
and J. M. Crarts, - - 
XVIII. Remarks on the Cretaceous rocks of the West known as 
No. 1, or the Dakota Group; by F. V. Haypen, - - 
XIX. Researches on Solar Physics; by Warren De va Rvs, 
Batrour Stewart and Bensamin Loewy, - - 
XX. On the Subterranean Sources of the Waters of the Great 
Lakes; by Grorcre A. SHUFELDT, - . - 
XXI. Experiments on the Influence of various oi and Inor- 
ganic Bodies upon Germination and Vegetation ; - M. Carey 
Lea, - - 
XXII. Contributions from the Sheffield ‘a of Yale Col- 
On Native Ry oe Se bbs s by Eo Wy. 
JOHNSON, - . . 
XXIII. On the sryela RUSH of natural Hydrated Torpia from 
California; by Joun M. Buaxe, : : 
XXIV. On the Objects and Method of  Mierlgy ; o T. Srerry 
Hun s : 
XXV. he meee Portable Vertical Circle ; is CLEVELAND 
ABB 4 z : . 
XXVI. oe Covcakelin, a new mineral species of the Mica Fam- 
ily, with some associated minerals, in the granite of gh 
Page. 
171 
- 179 
203 
Massachusetts ; by Josian P. Cooxg, Jr., - - <n 
XXVII. On a possible Geological Cause of Changes in the Position 
of the Axis of the Earth’s Crust; by Joun Evans, - - 230 
XXVIII. On Fluorescence; by J. Exeu Lovcurin, - - - 239 
XXIX. Note on Dr. Andrews’ oe on the Glacial — eae 
E. W. Hitearp, - 
XXX. On Naphtha and Wiiloniing Oil from Heavy eine mee 
Tar (Maltha) ; by B. Sittiman, ‘ - - 242 
