LETTER OP TRANSMITTAL, 
Des Moines, Iowa, August 11, 1906. 
To His Excellency, Albert B. Cummins, Governor of Iowa: 
In accordance with the provisions of title 2, chapter 5, section 136, 
code 1897, I have the honor to transmit herewith the proceedings of the 
twentieth annual session of the Iowa Academy of Science and request 
that you order the same to be printed. 
Respectfully submitted. 
L. S. ROSS. 
Secretary Iowa Academy of Science. 
