CONTENTS 



PAGE 



i. The Declining Birthrate 159 



John Burton Phillips, Ph.D. 



Professor of Economics and Sociology 



2. An Introduction to the Study of Rocky Mountain Bees 179 



T. D. A. COCKERELL 

 Professor of Systematic Zoology 



and 



W. W. ROBBLNS, M. A. 



Instructor in Biology 



