CONTENTS. vii 
NUMBER CXXIII. 
Anr. XXXVI. On some of the Mining Districts of Arizona near 
the Rio art with remarks on the — me. by 
B. Sin - - 289 
XXXVII. A meihee of Giving and of ficaetee the stipes of 
__ Crystals, for the determination of species, by the use of the 
Reflecting Goniometer; by Joun M. Buaxe, - 308 
XXXVIII. On the Quaternary Formations of the State of Missis. | 
sippi; by Eue. W. Hizearp, Ph.D., - - - 3iil 
XXXIX. Caricography ; by Prof.C. Dewry, - — - - 326 
XL. Ona Mechanical Finger for use with the Microscope sf 
H. L. Suita, . - 331 
XLI. The Distribution and Migrations of North PC aae Birds . 
by Spencer F, Barrp,_ - 337 
XLIf. On the Meteoric Fireball of Fly 13th, 1846 ; by Prof, 
é Dante. Kirxwoop : a oe Oe 
XLII. Whitney’s Gadiony of California, - - 3851 
. -XLIV. On the Green tint produced by See blue and etlols 
powders; by Prof.O. N. Roop, - - - 369 
XLV. A method of estimating and Correcting 4h bass caused 
, by the unequal length of the Calendar Months, in — 
Observations of Temperature; by E. L. DeForest, 371 
XLVI. On the comparative composition of some Recent Shells, 
a Silurian Fossil Shell, and a Carboniferous Shell Limestone ; 
by Prof. How, - e 379. 
XLVII. Experiments on the Produtos of Organi in Closed 
* Vessels ; by Georce Cuitp, M.D., - 381 
XLVIII. A word on the Origin of Life ; by a D. rita; - 389 
s Observations by Prof, W. H. Brewer on the presence 
. of living species in hot and saline waters in California, 
and on the Bicones of life of the seeds and _— of 
some plan - 391 
XLIX. On the Soicktis of Sisiadd . by Fr. es - 394 
SCIENTIFIC INTELLIGENCE. ~ 
Chemistry and Physics—On the wave-lengths of Fraunhofer’s lines, Dress, 28 
formation of a new island in the Bay, LD : mes, gone 
Me tsioay ot Xsaee, by Prot G:€. Sraaioe a a 
