CONTENTS. 



Number 225. 



Page 



Art. XVIII. — Geology of Bermuda Island; the Igneous 



Platform; by L. V. Pirsson 189 



XIX— The Ternary System: Diopside — Forsterite — Silica; 



by N. L. Bowen _ _ . 207 



XX. — Estimation of Iodine and Bromine in Haloid Salts by 



Means of Telluric Acid; by Harriet Isabelle Cole .. 265 



XXI. — Octahedral Crystals of Sulphohalite; by H. S. Gale 



and W. B. Hicks 273 



XXII. — Problematic Fossil from the Catskill Formation; by 



F. M. Van Tuyl and F. Berckhemer 275 



XXIII. — Determination of the " Solar Constant " by Means 

 of Computations Based on the Data of Balloon Ascen- 

 sions; by F. H. Bigelow._. _ 277 



SCIENTIFIC INTELLIGENCE. 

 Method for Cleaning Diatomaceae, E. R Darling, 282. 



