CONTENTS. 



Page 

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



Platform; by L. V. Pirsson ._ 189 



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

 by 1ST. L. Boaven 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; bv H. S. Gale 



and W. B. Hicks . 273 



XXII. — Problematic Fossil from the Catskill Formation; by 



F. M. Van Tuyl and F. Berckiiemer 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 Diatoniaceae, E. R. Darling, 282. 



