iv CONTENTS. 



The Popes and the Crusades. By Dana C. Munro 348 



A Rare Old Slavonic Religious Manual. By J. Dyneley 

 Prince 357 



Jointing as a Fundamental Factor in the Degradation of the 

 Lithosphere. By Frederick Ehrenfeld 363 



Sight and Signalling in the Navy. By Alexander Duane. . . 400 



Some Properties of Vibrating Telephone Diaphragms. A. E. 

 Kennelly and H. O. Taylor 415 



The Normal Gastric Secretion. By Martin E. Rehfuss.... 461 



The Common Folk of Shakespeare. By Felix E. Schelling, 471 



The Origin and Vegetation of Salt Marsh Pools. By John 

 W. Harshberger 481 



Pathological Anatomy of the Injected Trunks of Chestnut 

 Trees. By Caroline Rumbold 485 



Color-Photographs of the Phosphorescence of Certain Metallic 

 Sulphides. By Edward D. Nichols 494 



Cooperation as a Factor in Evolution. William Patten .... 503 



A Dynamical Theory of Antagonism. W. J. V. Osterhout. . 533 



Obituary Notices of Members Deceased: 



Sir Gaston Maspero I 



Samuel Dickson XIV 



Minutes i 



Index xvii 



