IV CONTENTS. 



Pack 

 IX. On the Oxide of DicldormethoxyquinonedibenzoylmethylaceUd. 



By C. Loring Jacksox and H. A. Tokrey 139 



X. On the Colored Compounds obtained from Sodic Alcoholates and 



Picrylchloride. By C. Loring Jackson and W. F. Boos 171 



XI. The Analysis of the Action of the Vagus Nerve upon the 



Heart. By L. J. J. Muskens 183 



XII. Certain Considerations concerning the Coinage of the Colony 

 and the Public Bills of Credit of the Province of the Massa- 

 chusetts Bay. By Andrew McFarland Davis . . . 189 



XIII. The Basis of the Science of Political Economy. By Edward 



Atkinson 213 



XIV. Studies on the Central and Peripheral Nervous Systems of two 



Polychcete Annelids. By Margaret Lewis 223 



XV. The Orthopteran Group Scudderice. By Samuel H. Scudder. 269 



XVI. A Table of Atomic Weights. By Theodore William 



Richards 291 



XVII. 1- Revision of the North American and Mexican Species of 

 Mimosa. 

 2. Revision of the North American Species of Neptunia. By 

 B. L. Robinson 303 



XVIII. On the Sources of Luminosity in the Electric Arc. By Henry 



Crew and Olin H. Basquin 335 



XIX. An Absolute Measurement of the Thomson Effect in Copper. 



By R. O. King 351 



XX. Note on Stolces's Theorem in Curvilinear Co-ordinates. By 



Arthur Gordon Webster 381 



XXI. A Contribution to the Study of Individual Variation in the 



Wings of Lepidoptera. By William L. W. Field . . 387 



XXII. On the Cause of the Retention and Release of Gases occluded by 



the Oxides of Metals. By Theodore William Richards 397 



