PAPERS PRESENTED 
13 
A Brief Survey of Economic Botany. E. H. Pammel 263 
Trees of the Proposed Mississippi Valley National Park. E. H. Pam- 
mel 265 
Shrubs of the McGregor District. E. H. Pammel 268 
Studies in the Germination of Some Woody Plants. E. H. Pammel 
and Charlotte King 273 
Notes on Phycomycetes. E E. Melhus 
A Eist of Some of the Phycomycetes in Iowa. J. M. Raeder .... 283 
Some Wound Responses of Foliage Eeaves. Robert B. Wylie 293 
A Key to the Plant Families of Central Iowa. - Winifred Ellsworth 
and Henry S. Conard 305 
Fossil Plants and Classification. Henry S. Conard 
A Study of the Vegetation of Austin Bluffs, Near Colorado Springs, 
Colorado. T. J. Fitzpatrick 
' Child Welfare 
Research in the Field of Mental and Physical Development of Chil- 
dren. B. T. Baldwin and Eorle I. Stecher 
Iowa Section, Mathematical Association of America 
Correlation Between Mental Tests and Grades in Mathematics of Fresh- 
man Engineering Students. Maria M. Roberts 
Playing with the ^ine and Projection Formulas. W. J. Rusk 
Certain Summation Formulas. John F. Reilly 
Some Properties of Function w = tanh F. M. Weida 
Derived Solutions of Differential Equations. M. E. Graber 
The Surface .^=log — . C. W. Emmons 
y 
Circles Mutually Tangent and Tangent to Concentric Circles at Specific 
Points; C. W. Wester 
A Study of Certain Reports of the “National Committee on Mathemat- 
ical Requirements.” Committee Report. J. V. McKelvey, Chairman 
