CONTENTS 



Original Papers 



Page 



Geophysics. — Thermal gradient of Kilauea Lava Lake. T. A. Jaggar, Jr.. . 397 



Crystallography. — The thermodynamic reversibility of the equilibrium rela- 

 tions between a strained solid and its liquid. F. E. Wright and J. C. 



HOSTETTER 405 



Mineralogy.— Ilsemannite, hydrous sulphate of molybdenum. Waldemar 

 T. Schaller 417 



Botany. — Seedling morphology in palms and grasses. 0. F. Cook 420 



Abstracts 



N 



Radiation 426 



Calorimetry 426 



Physiological Optics 427 



Geology 427 



Technology 428 



Proceedings 



The Geological Society of Washington 429 



The Botanical Society of Washington 434 



