CONTENTS OF THE SEVERAL VOLUMES. 171 



VOLUME IV. 



No. 1. 



Natural Gae and Coal Oil in Kansas E. H. S. Bailey. 1 



Experiments in the Solution of the Labor Problem F. W. Blackmar. 15 



The Servant-girl Problem Martha Boutelle Snow. 31 



The Condition of Packinghouse Employees A. E. Moody. 41 



Notes on the Mandible of Ornithostoma S. W. Williston. 61 



Notes of Air Resistance and Pressure E.G. Murphy. 63 



The Coffey ville Explosion Erasmus Haworth. 67 



No. 2. 



Continuous Groups of Projective Transformations Treated Synthetically, 



H. B. Newson. 71 



The Theoretical and Measured Pumping Power of Windmills. . .E. C. Murphy. 93 



Two Remarkable Genera of Diptera S. W. Williston, 107 



Involutoric Transformation of the Straight Line Arnold Emch. Ill 



On Toxotrypana of Gerstascker ; W. A. Snow. 117 



No. 3. 



A Curvimeter W. R. Crane. 121 



The Sands of the Kansas River Valley M. Z. Kirk. 125 



Biblioj^raphy of North American Dipterology, 1878-1895. . . .S. W. Williston. 129 



Horsebacks in the Kansas Coal Measures W. R. Crane. 145 



A Preliminary Report on the Glaciated Area of Kansas Earl G. Swem. 153 



A Geological Section at Providence, Mo Alban Stewart. 161 



Notes on the Discharge of the Kansas River at Lawrence, Kan., Since 1881, 



E. C. Murphy. 163 



Supplementary Notes on the Article on Continuous Groups. .H. B. Newson. 169 



Fissicorn Tachinidte S. W. Williston. 171 



List of Asilida?, Supplementary to Osten Sacken's Catalogue of North Ameri- 

 can Diptera, 1878-1895 W. A. Snow. 173 



Editorial Notes 191 



No. 4. 



On the Skull of Ornithostoma S. W. Williston. 195 



Bibliography of the North American Diptefa S. W. Williston. 199 



Involutoric Coilineation in the Plane and in Space Arnold Emch. 205 



A Study of the Type of the Greek Epitaphios with Special Reference to the 



Oration in Thucydides • David H. Holmes. 219 



A New Species of Dinictis from the White River Miocene of Wyoming, 



Elmer S. Riggs. 237 

 Continuous Groups of Projective Transformations Treated Synthetically, 



H. B. Newson. 243 



VOLUME V. 

 No. 1. 

 Projective Groups of Perspective Collineations in the Plane 



Treated Synthetically A mold Emch. 1 



Hoplophoneus occidentalis E. S. Riggs. 37 



One of the Dermal Coverings of Hesperornis S. W. Williston. 53 



The Duty of the Scholar in Politics Frank Hey wood Hodder. 55 



