IV CONTENTS 



NO. 3. 



PAGE 



1. State Highway Systems 189 



John B. Phillips 



2. The Fourteenth Amendment 197 



Charles E. Chadsey 



3. On the Siphon 209 



William Duane 



4. Some Special Algebraic Transformations Realized by 



Linkages 211 



Arnold Emch 



5. A Particular Method in Centroids 219 



J. J. Browne 



6. Preliminary List of Birds of Boulder County, Colo- 



rado 233 



Junius Henderson 



7. The Cotyledons and Leaves of Certain Papilionaoeae 239 



Francis Ramaley 



8. The Basis of Sociality 245 



Arthur Allin 



9. The Law of Future Specific and Social Efficiency . . 255 



Arthur Allin 



NO. 4. 



page 



1. Notes on the p- Discriminant of Ordinary Linear Dif- 



ferential Equations 269 



Arnold Emch, Ph. D., 



Professor of Graphics and Mathematics 



2. Newton's Five Types ot Plane Cubics Obtained by the 



Steinerian Transformation 275 



Arnold Emch, Ph. D., 



Professor of Graphics and Mathematics 



