1922.] PUBLIC DOCUMENT — No. 31. 25a 



organization of the Experiment Station. The complete absence 

 of late blight in the year just past made impossible the measure- 

 ment of the action of fungicides on this disease. Yield records 

 indicated no appreciable stimulation of growth by the use of 

 Bordeaux. 



Department of Plant and Animal Chemistry. 



Project 5. "Chemistry of arsenical insecticides." 



Professor Holland and Mr. Dunbar. 



Despite its name this project has practically become a study 

 of the chemistry of insecticides and fungicides. Work under 

 this project the past year included the preparation of Bulletin 

 No. 201 in co-operation with the Departments of Entomology 

 and Botany; and a large amount of analytical work done in 

 co-operation with these same departments, with the Depart- 

 ment of Pomology, and with the State Department of Con- 

 servation. Analytical work was done on concentrated lime- 

 sulfur, lime-sulfur paste, dry lime-sulfur, Sulco V-B, Sander's 

 dust, dry lead arsenate and NuRexo. Assistance was also 

 given in fumigation experiments with hydrocyanic acid. 

 Determination of arsenic in the bodies of dead bees was also 

 made to determine the probability of death being caused by 

 this substance. 



Project 13. "A new method for the analysis of dry lime- 

 sulfur mixtures." 



Assistant Professor Jones. 



Work on this project has been carried on at intervals for the 

 past two years. Results are now being prepared in manu- 

 script form, in order that the method may be critically ex- 

 amined as to its accuracy and usefulness. 



Dejxirtment of Entomology. 



Project 1. "Studies of causes of burning of foliage by 

 arsenicals." 



Professor Fernald and Assistant Professor Bourne. 



This project was started in 1908. ^York has been com- 

 pleted and manuscript prepared presenting in graphic form the 



