CONTENTS 



Original Papebs 



Page 

 Electricity. — The four-terminal conductor and the Thomson bridge. Frank 



Wenner 63 



Evolution. — Evolution in discontinuous systems. III. Alfred J. Lotka ... 66 

 Pharmacology. — Physiological studies in anaphylaxis. VI. The reaction 



of the opossum to horse serum. W. H. Schultz and H. E. Jordan 74 



Abstracts 



Astronomy 77 



Navigation 80 



Atmospheric Electricity 80 



Physics 81 



Chemistry 82 



Geochemistry 83 



Petrology ' 83 



Geology 84 



Bacteriology 86 



Epidemiology 87 



Pathology 88 



References: Agriculture 88 



Pboceedinos 



Washington Academy, Philosophical and Botanical Societies 90 



Biological Society ' 93 



Programs and Announcements 



Philosophical Society *■ 94 



