24 



in research in the herbarium during the year and more than 

 16,000 specimens have been loaned to workers in other places. 

 More than 30,000 annual plants were grown in the bed and 

 borders, 1500 new hybrid tea roses were planted in the rose 

 garden, 800 plants of heather added to the Thompson Me- 

 morial Rock Garden, over 100 mountain laurels planted in the 

 woodland background of the rock garden, 1,125 rhododen- 

 drons and laurels planted in the new rhododendron glade, and 

 about 1,000 trees and shrubs set out in the permanent collec- 

 tions. 



Dr. F. E. Gardner of the U. S. Horticultural field station 

 at Beltsville, Md. and Dr. Ezra J. Kraus of the department of 

 botany of the University of Chicago report success in develop- 

 ing holly berries and good quality strawberries by spraying the 

 flowers with a dilute solution of indoleactic acid, one of the 

 hormone-like substances. The method is said to be cheap enough 

 to be commercially practical. 



