BULLETIN OF THE UNIVERSITY OF KANSAS 



Vol. XXI. DECEMBER 1, 1919. No. 17. 



Science Bulletin 



Vol. XI. 



(Continuation of Kansas University Quarterly.) 



LAWRENCE, KANSAS 



Published Semimonthly from January to June and Monthly from July to 

 December, inclusive, by the University of Kansas, 



Entered as second-class matter Decembt?r 29, 1910, at the post office at La^wrence, Kansas. 

 under the act of July 16, 1894. 



