18a EXPERIMENT STATION. [Jan. 



Chemistry Project 5, "Chemistry of arsenical insecticides." 



Professor Holland and Mr. Dunbar. 



This project is no longer confined to arsenical insecticides, but has practically become 

 a study of the chemistry of insecticides and fungicides. The work is in large measure 

 co-operative with other departments of the State and Station, and is largely confined 

 to analytical work. 



It has furnished needed information relative to various types of commercial sulfur 

 compounds, although as yet scientific entomological and pathological data are lacking 

 for the interpretation of analytical results in terms of toxicity, or preferably of efficiency. 

 This in a measure is also true of waste tobacco. 



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

 mixtures." 



Assistant Professor Jones, 



Work on this project has been completed, and report submitted for publication. 



Chemistry Project 20. "A study of the fundamental factors affecting the sus- 

 pension, adhesiveness, toxicity and general efficiency of copper fungicides." 



Professor Holl.vnd and Mr. Dunbar. 



The work outlined is very extensive, including chemical, physical and pathological 

 studies of a considerable variety and large number of compounds, requiring more or less 

 co-operation by the Departments of Botany and Physics, and final verifications by field 

 experiments. A portion of the literature has been reviewed, preliminary work on pro- 

 duction of some of the compounds undertaken, stability and certain physical properties 

 have been not«d, and hundreds of suspension tests have been conducted to determine 

 the effect of different amounts of lime under varying conditions and the influence of 

 protective colloids and deflocculating agents. 



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



Professor Fernald and Assistant Professor Bourne. 



This work has been completed, and Bulletins Nos. 207 and 210 of this Station give 

 the results with lead arsenate, lime arsenate and some other arsenicals. A third bul- 

 letin, on Paris green, is in preparation. 



Entomology Project 12. "Determination of the best strength of lime-sulfur." 



Assistant Professor Bourne. 



Tests of various dry sulfids have been made under differing conditions, in comparison 

 with different strengths of the liquid lime-sulfur. The tests have not sufficiently covered 

 the ground as j'et to make a report of results possible. 



Entomology Project 13. "Study of the possible injurious effects of Scalecideon 

 trees." 



Assistant Professor Bourne. 



Tests of this material must be continued for several years before results can be re- 

 ported. 



Entomology Project 14. "Does spraj'ing orchards kill bees?" 



Assistant Professor Bourne. 



The investigations thus far have been quite suggestive, particularlj' indoor ones, but 

 the inclement weather following the "cal3'x spray" out of doors last spring makes fur- 

 ther studies necessary. 



Entomology Project 15. "Determination of efficiency of nicotine sulfate dusts." 



Assistant Professor Bourne. 



The nicotine sulfate dusts proved ver.y effective in nearly all tests. The high prices 

 of these dusts, however, often prohibit their use. Dusts of ground tobacco, reinforced 



