CONTENTS. Vll 



HSPumlDer 275. 



Page 



Art. XXX. — Radioactive Properties of the Mineral Springs 



of Colorado ; by O. C. Lester 621 



XXXI. — Spotted Lakes of Epsoraite in Washington and 



British Columbia ; by O. P. Jenkins 638 



XXXII. — A Study of Some American Fossil Cycads ; Part 

 VIII, Notes on Young Floral Structures ; by G. R. 



WlELAND . 645 



XXXIII.— Means of Solving Crystal Problems ; by J. M. 



Blake 651 



XXXIV. — Separation of Germanium from Arsenic by the 

 Distillation of the Chloride in the Presence of a Chro- 

 mate ; by P. E. Browning and S. E. Scott 663 



XXXV. — Mysticocrinus, a new genus of Silurian Crinoidea; 



by F. Springer (With Plate II) __ 666 



Grove Karl Gilbert.- __ _. 669 



Henry Shaler Williams _ 682 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — A New Method for the Quantitative Estimation of 

 Vapors in Gases, H. S. Davis and Mart D. Davis: Determination of Or- 

 ganic Matter in Soils, J B. Rather, 688. — A New Reaction for Osmium, M. 

 T. Tschug4eff : Chemical Combinations among Metals, M. G. and Clara 

 Giua-Lollini : The Zinc Industry, E. A. Smith : Stoichiometry, S. Young, 

 689. — Elements of General Science. Revised Edition, O. W. Cadvvell and 

 W. E. Eikenberry, 690. — Airplane Characteristics, F. Bedell, 691. 



Miscellaneous Scientific Intelligence — Medical Contributions to the Study of 

 Evolution, J. G. Adami, 691. 



Obituary — C. R. Eastman : W. B. Phillips, 692. 



