58 BULLETIN 1027, U. S. DEPAETMENT OF AGEICULTUEE. 



SUMMARY. 



The amounts of arsenic, lead, and. copper remaining on mature 

 fruits and vegetables which have been sprayed according to various 

 schedules were determined in the Bureau of Chemistry. Table 15 

 gives the maximum and minimum results. 



Because of overspraying or late spraying, comparatively large 

 quantities of spray residues were found in some cases. This em- 

 phasizes the importance of spraying according to the schedules rec- 

 ommended by the Bureaus of Entomology and Plant Industr3^ 



The extent of the reduction of spray residues on the mature fruit 

 and vegetables by washing and wiping them was determined by a 

 series of analyses before and after such treatment . 



When peeled, sprayed fruits and vegetables contain essentially the 

 same amounts of arsenic, lead, and copper as the unspra3^ed products, 

 indicating that practically all of the spray residues can be removed 

 by peeling. 



From the results reported in this bulletin it is evident that when 

 fruits and vegetables are sprayed in accordance with the schedules 

 recommended by the Bureaus of Entomology and Plant Industry, but 

 little of the material used remains on the fruit or vegetable at har- 

 vest time. 



LITERATURE CITED. 



(1) Academy of Medicine (France). 



Proc. Acad. Med.. Feb. 18, 1908. Bull. acad. med., 3 ser., 59 (1908): 246. 



(2) 



(3) 



Proc. Acad. Med., Feb. 2, 1909. Bull. acad. med., 3 ser., 61 (1909): 194. 



Proc. Acad. Med., Nov. 11, 1913. Bull. acad. med., 3 ser., 70 (1913): 

 388, 369. 



Sur un projet de decret portant modification de I'ordonnance de 1846 

 relative a la vente des substances veneneuses. Bull. acad. med., 3 ser., 

 70 (1913^: 152. 

 (4) ___ 



(5) 



Proc. Acad. Med., Mar. 3, 1914. Bull. acad. med.. 3 ser., 71 (1914): 

 324, 325, 326. 



(6) Alwood, W. B. 



Treatment of diseases of the grape. Va. Agr. Exp. Sta. Bull. 15 (1892): 41. 



(7) Ampola, G., and Tommasi, G. 



I composti di arsenico in agricoltura. Ann. staz. chim. agrar. sper. Roma, 

 2 ser., 5 (1911): 241; J. Soc. Chem. Ind., 31 (1912): 891; Chem. Abst., 7 

 (1913): 1255; Exp. Sta. Rec, 30 (1914): 130. 



(8) Andouard, a. 



Le cuivre dans les vins pro-venant de vignes trait^es par le sulfate de 

 cuivre. Compt. rend., 104 (1887): 195; Bull. soc. nat. agr. (France), 47 

 (1887): 40; J. pharm. chim., 5 ser., 15 (1887): 290. 



