PROCEEDINGS 
OF THE 
THIRTEENTH ANNUAL SESSION 
OF THE 
IOWA ACADEMY OF SCIENCES. 
The thirteenth annual session of the Iowa Academy of 
Sciences was held in the geological rooms at the capitol build- 
ing in Des Moines, December 27 and 28, 1898. In business ses- 
sions the following matters of general interest were passed 
upon. 
REPORT OF THE SECRETARY-TREASURER. 
To the Members of the Iowa Academy of Sciences : 
The Academy has, during the past year, had a very satis- 
factory growth in the addition of sixteen associate members. 
The proceedings include 248 pages, presenting an interesting 
array of matter both instructive and useful. The appearance 
of the proceedings was delayed longer than usual on account of 
the legislative printing. Several papers presented were nec- 
essarily omitted on account of reaching our limit allowed for 
the volume. 
