PROCEEDINGS 



OF THE 



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AMERICAN PHILOSOPHICAL, ,$Of:iET\ 



HELD AT PHILADELPHIA; 

 FOR PROMOTING USEFUL KNOWLEDGE 



Vol. XLV, May-September. 1906. No, 183. 



CONTENTS. 



tin Positive and Negative Electrons. By H. A. Lorentz 103 



Form Analysis. By A. A. Michelson no 



Benjamin Franklin as Meteorologist. By Professor Cleveland Abbe 117 



Was Lewis Evans or Benjamin Franklin the first to Recognize that 

 our Northeast Storms come from the Southwest, By William 



Morris Davis 129 



Pyrite from Cornwall, Lebanon County, Pennsylvania. By 



Charles Travis 131 



Elementary Species in Agriculture. By Professor Hugo de Vries 149 



, Dilute Sulphuric Acid as a Fungicide, By Henry Kraemer , 157 



Stated Meetings May 4 ,* 164 



The San Francisco Earthquake of 1906. By Prof. George Davidson 164 



"• ' The New Agriculture. ' ' By Burnet Landreth 1 66 



Stated Meetings May 18 178 



Points of Interest involved in the San Francisco Earthquake. By 



Prof. George Davidson 178 



PHILADELPHIA 



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