THE 



KANSAS UNIVERSITY 

 SCIENCE BULLETIN. 



Vol. X, No. 15— JANUARY, 1917. 



(Whole Series, Vol. XX, No. 15.) 



CONTENTS 



A Mule and a Horse as Twins, and the Inherit- 

 ance OF Twinning W. R. B. Robertson. 



PUBLISHED BY THE UNIVERSITY, 



UWRENCE, KAN. 



Entered at the poBt-ofSce in Lawrence as second-class matter. 



