—— oe. oe 
CONTENTS OF VOLUME XI. 
NUMBER XXXI. 
Arr. I. Comparison of Experiments on American and Foreign 
Building Stones to pepe their vale eit and du- 
rability ; by Prof. W 
- IL On the Law of the loduciltt of an Elsaiae Carvent cipon ital 
/ iin apie in a straight prismatic conductor, and of dis- 
charges if Machine sctittatn ‘pean straight wines; by 
ae J. H. Lan 17 
Ill. On Mamocae by Cus ARLES Urage Su HEPAR : 36 
1V. An Essay on the Classification of Reatertes’ sid Plandtie: : 
visions of the Animal Kingdom; by Cuartes Girarp, - 4i 
V. Memoir on Emery ; . Lawrence Suiru, M.D.—Second 
part.—On the Minerals associated with Em 
. ery 
VI. On the Velocity of the Galvanic Current in Telegraph 
Wires; by B. A. Goutp, Jr., in a Report to Prof. A. D. : 
p- 23; with a notice of two new tesrealipaias ai J. W. 
AILEY. 82 
Vill. Sisedltnncaus Notices : by - W, Rie. LEY, 85 ~ 
- On the time required to raise the Galvanic Curtéak: to its 
a ~ Maximum in Caled Conductors, and its importance in Elee- 
tro-Mechanics ; 3 by Prof. Cuas. G. Pace, } 
X. A new figure in Mica and other Phenotbens ‘of Plated 
Light; by Prof. Cuas. G. Pace, 
XI. . Descriptions of new species of Fung collected by the U. S. me 
4 xploring Expedition under C. W -8.N.,¢ site eb a 
der; by Rev. M. J. Berxetey and iy M. A. Cur 
XII. On the markings of the Carapax of Crabs; by ton D. Bam,” 93. 
' th ‘Chemical examination of a Phos phate of Iron, sii eae 
and Lithia, from Norwich, Mass. ; e W. J. Cr 
. On the Physical and Crypt £ Pace of the | oe 
Phosphate ¥ Iron, Manganese an ithia 9 sorvic ip bpd eee 
achusetts ; oF Adee aed = eo | 
ce. oft th c : 
