vi CONTENTS. 
Page. 
XIII. On the Microscopic Structure of the Teeth of the Lepi- 
dostei, and their Analogies with those of the Labyrin- 
thodonts ; by Jerrrigs Wyman, M. D.—(with a plate,) 350 
XIV. On Vibrating Dams; by Prof. Ex1as Loomis, - - 363 
XV. Reply of J. P. Cournovy, to the accusations of J. D. 
Dana, Geologist to the Exploring Expedition, contained 
on pp. 130 and 145 of this Volume, - - 378 
XVI. Experiments made with one hundred pairs of Broad 
attery, passing through one hundred and sixty miles 
of insulated wire; by Prof. S. F. B. Morse, - 
XVII. On the Fossil Foot-prints of Birds and Impressions of 
Rain-drops in the Valley of the Connecticut ; m Cuas. 
Lygtt, Esq., V.P.G.S., . + 394 
XVIII. Bibliographical Notices :—Dr. De Kay’s ieront on: the 
Zoology of New York, 397.—Agassiz’s Monographies 
D’Echinodermes Vivans et Fossiles, 399.—Lea’s De- 
scription of New Fresh-water and Land Shells: Gra- 
ham’s Chemistry, 401. 
MiscELtanies.—Fossil Fruits described by Dr. Gideon Algernon 
Mantell, 401.—Eremite, 402.—Meeting of the British Asso- 
ciation at Dublin: Animal of the Belemnite : Meteoric Epoch 
of August: Death of Mr. Bakewell, 403.—Death of Prof. 
Hall: Death of Mr. J. N. Nicollet, 404, 
