LETTER OF TRANSMITTAL. 
Des Moines, Iowa, Sept. 6, 1907. 
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 proceed- 
ings of the twenty-first 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. 
