y5 



vance notes and abstracts of results 1 , all data of 

 which will be repeated in the following pages. 



1. Free and Livingston,- Gar. Inst, of Y/ash. f 

 Yearbook 14; 60-61 (1915); Livingston and Free,- Car, 

 Inst, of Wash., Yearbook 15: 78 (iyi6), Johns Hopkins 



Univ., Girc. : (1917); Gannon and Free,- 



Science 45: 178-180 (iyi7). 



