CONTENTS. 



Page 



I. An Apparatus fo7- Continuous Vacuum Distillation. By Charles 



F. Mab^:ry 1 



11. Preliminary Diagnoses of Netv Species of Lahoulbeniaceae. — V. 



By Roland Thaxter 7 



III. On Catiloglossum Transversarium Fries (Bosc). By John R. 



Johnston 50 



IV. Flora of the Galapagos Islands. By B. L. Robinson. (With 



the collaboration of specialists.) 75 



V. Concerning Gas- Analysis hy Measurement in Constant Volume under 



Changing Pressure. By Theodore William Richards . 271 



VI. A Method for Determining the Index of Refraction of Solid Hydro- 

 carbons with the Pulfrich Refractometer. Index of Refraction 

 of the Solid Hydrocarbons in Petroleum. By Charles F. 

 Mabery and Lee Shepherd 281 



VTI. The Significance of Changing Atomic Volume. III. — The Rela- 

 tion of Changing Heat Capacity to Change of Free Energy, Heat 

 of Reaction, Change of Volume, and Chemical Affinity. By 

 Theodore William Richards 291 



VIII. The Speed and Nature of the Reaction of Bromine upon Oxalic 

 Acid. By Theodore William Richards and Wilfred 

 Newsome Stull 319 



IX. Regidar Singular Points of a System of Homogeneous Linear Dif- 

 ferential Equations of the First Order. By Otto Dunkel . . 339 



X. The Influence of Atmospheres of Nitrogen and Hydrogen on the 

 Arc Spectra of Iron, Zinc, Magnesium, and Tin, Compared ivilh 

 the Influence of an Atmosphere of Ammonia. By Royal A. 

 Porter 371 



XI. 1. Babingtonite from Somerville, Mass. 



2. Bahingtonite from Athol, Mass. By C. Palache and F. R. 

 Fhaprie 381 



XII. On the Thermal Development (f the Spark Spectrum of Carbon. 



By Henry Crew and John C. Baker 395 



XTir. The Universally Exact Application of Faraday's Law. By Tiieo- 



DOKK WlI.I.I.VM Rk'IIAKDS AND WlLFKKD NeWSOME StULL 407 



