CONTENTS 



Original Papers 



Page 

 Astronomy. — On "earth light," or the brightness, exclusive of starlight, of 



the midnight sky, W. J. Humphreys 239 



Meteorology. — Dust layers in the atmosphere and changes in the neutral 

 points of sky polarization, W. J. Humphreys 241 



Holes in the air, W. J. Humphreys 243 



Hurricanes of the West Indies and other tropical cyclones, Oliver L. 

 Fassig 246 



Physics — New methods for displacement measurements and temperature 

 uniformity applied to the determination of linear expansivity, Arthur 

 W. Gray 248 



