INDEX 
379 
Trowbridge, A.' C., Schedules for the Field Descriptions of Sediment- 
ary Rocks 127 
Turtle, Bell’s, Nest-digging and Egg-laying Habits of, Frank A. 
Stromsten .................... /..... 229 
Tyrol, See Dolomites. 
U 
Universe, Cosmology of the : The Address of the President, D. W. 
Morehouse 41 
V 
Variation, Chance in Development as a Cause of, P. W. Whiting. . .... 230 
Venation, See Leaves, Venation in. 
Verbeck, L. M., See Hendrixson and Verbeck. 
W 
Walter, O. T., An Iowa Cambrian Eurypterid 127 
Water, Hardness, See Mercuric Chloride. 
Wave Filters, See Acoustic Wave Filters. 
Webster, R. L., Some Notes on Bmpoasca flavescens . ............... 195 
Weeds, Effect of, upon Crop Production, A. L. Bakke and L. H. Pam- 
mel 271 
Werkenthin, Fred C., Memorial of, John N. Martin 33 
Werkenthin, Fred C., Description and Key to Genus Cucurbita 281 
Werkenthin, Fred C., The Founders of the Art of Plant Breeding. . 291 
Werkenthin, Fred C., See Martin, Werkenthin and Hudson. 
White Marked Tussock Moth, Study of, Susannah Poulter. 165 
Whiting, P. W., Chance in Development as a ‘Cause of Variation.... 230 
Wilson, Ben Hur, Memorial of Chalmers Colin Norwood. 37 
Wilson, Ben H., Deductions from the Occurrence and Character of 
two large Quartzose Conglomerate Bowlders of Unknown Origin 
found in the Kansan Drift Sheet at Centerville, Iowa. ............. 121 
Winfield’s Deep Well, J. M. Lindly. ...... 110 
Wound Healing, See Leaves. 
Wylie, Robert B., Submarginal Venation of Foliage Leaves.......... 233 
Wylie, Robert B., Types of Wound Healing in Certain Foliage Leaves 238 
X 
X-rays, Homogeneous, of Wave Length 0.712 A° Unit, Scattering of, 
by Carbon, Lithium and Hydrogen, C. W. Hewlett. 151 
Y 
Yeast, Studies on, V-Is Bios a Single Substance? Ellis I. Fulmer and 
V. E. Nelson .......... ................ . 371 
Yosemite and Adjacent Region, Flora of, L. H. Pammel. 245 
