REPORTS OX INVESTIGATIONS AND PROJECTS. 



The follovv'ing reports and abstracts of reports show the pro- 

 gress of investigations carried on during the year, including 

 not only those authorized for 1913, but others on which work 

 has been continued from prior years. Reports of Directors 

 of Departments are given first, followed by reports of recipi- 

 ents of grants for other investigations, the latter arranged 

 according to subjects. 



55 



