CONTENTS. Ill 



NiPHER, F. E. — On the Expression of Electrical Resistance 



in Terms of a Velocity 535 



Hambach, G. — Notes about the Structure and Classification 



of the Pentremites 537 



Hambach, G. — Description of New PalcEozoic Echinoder- 



mata 548 



Spencer, J. W. — Niagara Fossils ^^^ 



Broadhead, G. C. — Missouri Geological Surveys 611 



LuEDEKiNG, Dr. Chas. — On the Specific Heats, Specific 

 Gravities, and the Heats of Hydration of the Acids of 

 the Fatty Series, and their Mixtures with Water 625 



NiPHER, F. E. — Isodynamic Surfaces of the Compound Pen- 

 dulum 644 



Reed, C.J. — The Graphical Representation of the Relation 



between Valence and Atomic Weight 649 



Wheeler, H. A., and Luedeking, C. — Iodine in Blow- 

 piping 676 



General Index 6S3 



Errata 6S9 



Journal of Proceedings i-cxxviii 



Publications donated. 



" received in exchange. 



