CONTENTS 



Original Papers 



Page 

 Physics. — Polarized skylight and the petrographic microscope. W. S. Tan- 

 gier Smith 229 



Paleontology. — The uropods of Acanthotelson stim-psoni. T. D. A. Cock- 

 erell 234 



Botany. — Comparative notes on the floras of New Mexico and Argentina. 

 Paul C. Standley 236 



References 



Physics 246 



Chemistry 245 



Soils 246 



Botany 246 



Horticulture 246 



Forestry 247 



Agronomy 247 



Bacteriology 248 



Phytopathology 248 



Plant Physiology 249 



Evolution 250 



Animal Husbandry 250 



Proceedings 



The Geological Society 251 



The Biological Society 256 



The Celebration of the One Hundredth Anniversary of the Organization of 

 the U. S. Coast and Geodetic Survej' 260 



