CONTENTS 



Original Papers 



Page 

 Physics. — A method for measuring Earth resistivity. Frank Wenner... 561 

 Chemistry. — The dissociation of calcium carbonate below 500°C. R. B, 



SOSMAN, J. C. HOSTETTEE, AND H. E. MeRWIN 563 



Botany. — ^Microcitrus, a new genus of Australian citrous fruits. Walter T. 

 Swingle , 569 



Abstracts 



Geology 579 



Paleontology 582 



Zoology 583 



References 



Chemistry 585 



Botany 585 



Forestry 586 



Agronomy 586 



Bacteriology 586 



Phytopathology 587 



Plant Physiology 588 



Evolution 588 



Technology 588 



