150 -VICTOR !:. SHELFORD. 



Hilclcbrand; some of the coHrt-iin- was done in cooperation with 

 Dr. Meek and Mr. Hildcbrand. \\'iilumt the a-si>tance of 

 these gentlemen this paper could ni h,i\c Uvn \vrium. The 

 writer is also indebted to Mr. Ellis L. Michael for tin- ivadiiiL; 

 of the manuscript. 



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