Xvi CONTENTS. 
ARTICLE IX. 
Remarks on the Structure of the Feet of Megalonyx. By Joseph Leidy, M.D., 
ARTICLE X. 
Notes on Certain Modes of Measuring Minute Intervals of Time. By J. C. Adamson, D. D., 
ARTICLE XI. 
Della Correlazione delle Forze Chimiche colla Rifrangibilita delle Irradiazioni; Di Zantedeschi. speri- 
menti eseguiti col Calorico Solare, 
ARTICLE XII. 
Geological Sketch of the Estuary and Fresh Water Deposit of the Bad Lands of the Judith, with some 
Remarks upon the Surrounding Formations, with a map, plate VIII. By F. V. Hayden, M. D., 
ARTICLE XIII. 
Extinct Vertebrata from the Judith River and Great Lignite Formations of Nebraska, with three plates, 
IX, X, XI. By Joseph Leidy, M. D., 
ARTICLE XIV. 
“A Sketch of the Botany of the Basin of the Great Salt Lake of Utah. By EH. Durand, 
ARTICLE XV. 
Observations of the Magnetic Dip in the United States. By Prof. Elias Loomis, 
ARTICLE XVI. 
‘Revision of the Buprestidz of the United States. With a plate, XII. By John L. Le Conte, M.D., 
ARTICLE XVII. 
Analytic Orthography; an investigation of the Sounds of the Voice and their Alphabetic Notation. By 
S. 8. Haldeman, 
107 
109 
117 
123 
155 
181 
187 
