CONTENTS 



Original Papers 



Pace 



Mathematics. — A precision projection plot. F. E.|Wright 521 



Physics. — The theory of the torsion and the rolling ball viscosimeters, and 



their use in measuring the effect of pressure on viscosity. M. D. 



Hehsey 525 



Chemistr}-. — The saccharimetric normal weight and the specific rotation of 



dextrose. Richard F. Jackson 530 



Chemistry. — Preliminary report on the system, lime: ferric oxide. R. B. 



Sosman and H . E. Merwin 532 



Plant Morphology. — Morphology and evolution of leaves. O. F. Cook. . . . 537 

 Ethnobotany. — Identity of cohoba, the narcotic snuff of ancient Haiti. 



William Edwin Safford 547 



Abstracts 



Physics 563 



Geology 564 



Engineering 568 



Technology 568 



