LECTURES AND MEETINGS OF SOCIETIES. 315 



21. Feediug-habits of the Pine wood Woodpeckers. By Ei'iiest E. Thompson. 



22. The Distribution of the Gentis Harporhynchus. By T. S. Palmer. 



23. Exhibition of sijecimens of the Imperial Woodpecker. By T. S. Palmer. 



The papers read before the Xational Academy of Sciences, at its 

 annual meeting in April, 181)3, are indicated below : 



I. On the Systematic Relations of the Opbidia. By Prof. E. D. Cope. 



II. Biographical Memoir of Gen. Montgomery C. Meigs. By H. L. Abbott. 



III. On the Nature of Certain Solutions, and on a new means of investigating them. 

 By M. C. Lea. 



IV. The Relations of Allied Branches of Biological Research to the Study of th(v 

 Development of the Individual, and the Evolution of Groups. By Prof. A. Hyatt. 



V. The Endosiphouoidea (Endoceras, etc.), considered as a new order of Cepha- 

 lopoda. By Prof. A. Hyatt. 



VI. A New Type of Fossil Cephalopods. By Prof. A. Hyatt. 



VII. Results of Recent Researches upon Fossil Cephalopods of the Carboniferous. 

 By Prof. A. Hyatt. 



VIII. Biographical Memoir of Julius Erasmus Hilgard. By Prof. E. W. Hilgard. 



IX. Monograph of the Bombycine Moths of America, North of Mexico: Part I — 

 NotodontidiB. By Dr. A. S. Packard. 



X. Intermediary Orbits. ByG. W.Hill. 



XI. The Relations between the Statistics of Immigration and the Census Returns 

 of the Foreign-born Popuhition of the United States. By Richmond Mayo-Smith. 



XII. Statistical Dat^i for the Study of the Assimilation of Races and Nationalities 

 in the United States. By Richmond Mayo-Smith. 



XIII. Telegraphic Gravity Determinations. By Dr. T. C. Mendenhall. 



XIV. Comparison of Latitude Determinations at Waikiki. By Dr. T. C. Menden- 

 hall. 



XV. A One-volt Standard Cell. By H. S. Carhart. 



XVI. Fundamental Standards of Length and Mass. By Dr. T. C. Mendenhall. 



XVII. Peptonization in Gastric Digestion. By R. A. Chittenden. 



