PUBLICATIONS XX ix 



Bulletin 311. Climate: Its Physical Basis and Controlling Factors. 

 No. 312. Invariability of our Winter Climate. 



Explanation of the Weather Map. 



Classification of Clouds. With Chart. 



Photomicrographs of Snow Crystals. 



BUREAU OF PLANT INDUSTRY 

 Circular 71. Legume Inoculation and the Litmus Reaction of Soils. 



