CONTENTS OF VOLUME Xx. 
NUMBER LVIII. 
Art. I. The Smithsonian Institution, - 
II. Description of a new species of Clathropteris, dissoeeeed in 
_ the Connecticut Valley Sandstone ; by E. Hircucock, Jr., M.D. 
III. On the Periodical Variations of the Declination and Directive 
Force of the Magnetic Needle; by Prof. W. A. Norton, 
IV. On the Periodical Rise and Fall of the ae by Major 
LacHLAN,- - 
V. Remarks on the hore which joes on in tbe Ricasinne 
and Composition of Mineral Veins near the surface, with 
particular reference to the East Tennessee aid ied ai 
by J. D. Wuirney, 
VI. On a Universal Siidtoatoe’ for Microscopes by Prof. iy W. 
Barttey.—With a Plate, - - 
VII. On the Composition of Eggs in the par: series ; y Va 
LENCIENNES and Frémy.—Part III, 
VIII. Observations on the Extent of the Gold Spats of Califor. 
nia and Oregon, with notices of Mineral localities in Cali- 
fornia, and of some remarkable “cer of ee. 
Gold; by Wm. P. Buaxe,- - 
ix Raalyeis of Idocrase from Ducktown, Polk Co., Tena : by 
2W. Matter, Ph.D., - 
X. Observations on Binocular Vision ; ; & Prof, Ww. B. Aicass, 
XI. Researches in Magnetisation ; by M. Jerome Nicktis, — - 
XII. Correspondence of M. Jerome Nicxuis—Annual Session of 
the Academy of Sciences, 102.—Spongy Metals used in 
therapeutics: Telegraphic messages simultaneous in two 
directions—Calcium, Barium, Aluminium, 103.—Piscicul- 
ture, 104.—Necrology.—M. Gauss, 104; L. G. Duvernoy, 
105.—Magnetic force of Oxygen: Oxygen in the nascent 
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