REPORTS ON INVESTIGATIONS AND PROJECTS. 



The following reports and abstracts of reports show the 

 progress of investigations carried on during the year, in- 

 cluding not only those authorized for 1909, but others on 

 which work has been continued from prior years. Reports 

 of Directors of Departments are given first, followed by 

 reports of recipients of grants for other investigations, the 

 latter arranged according to subjects. 



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