TRANSACTIONS 



OF THE 



AMERICAN PHILOSOPHICAraiffiTY 



riELI) AT PHILADELPHIA 



FOR PROMOTI^iT UlSEFUL KiNUWLEDGE 



VOLUME XXI— NEW SERIES 



PART II 



Aeticle II — On the Conatnietion of Isobaric Charts for High Leveh in the Earth's Atmosphere and their 



Dynamic Significance. By J. W. Sandstriim 



'■ ghHadelphla: 

 THE AMERICAN PHILOSOPHICAL SOCIETY 

 104 South Fifth Stueet 

 1900 



