CONTENTS 



PAGE 



1. A Theorem on Differential Functions 127 



S. Epsteen, Ph.D., 



Assistant Professor of Engineering Mathematics 



2. On an Algebra in Three Units , 129 



S. Epsteen, Ph.D., 



Assistant Professor of Engineering Mathematics 



and 

 Harry V. Welch, B.A. 



3. The Appeal of Alexius for Aid in 1095 ^35 



Edward Tuthill, M.A., 



Assistant in History 



4. Scientific Expedition to Northeastern Colorado . . 145 



Members of Museum and Biological Staffs 



5. The Mollusca of Colorado, Part II 167 



Junius Henderson, 



Curator of the Museum 



6. The Silva of Colorado. II. The Poplars, Aspens and 



COTTONWOODS 185 



Francis Ramaley, Ph.D., 



Professor of Biology 



