18 



BULLETIN 1027, U. S. DEPARTMENT OF AGEICULTURE. 



The whole and pulp of apples were fumed m 7-inch casseroles and the 



skins were fumed in 5-inch casseroles, all being transferred to 4-inch 



casseroles before final fuming. Casseroles were covered until final 



fuming. 



RESULTS OF EXPERIMENTAL WORK. 



The results of the chemical analyses appear in Tables 5 to 15, 

 inclusive. 



Table 5. — Arsenic and lead remaining on sprayed peaches at picking time. 













Arsenic(As). 



Lead (Pb). 







tja 



J3 



Sam- 

 ple 

 No. 



Spray material used.^ 



Date 

 sprayed. 



Determi- 

 nations 

 made on. 









.0 



'a 



'6 





■345 





■r"3 







£1 IS 

















q"" 







q"" 



< 



i-j 



k:) 



> 



















Mg 



per 











191^ 



. 





Parts per million. 



peach. 



P.ct. 



Gr. 



23196 2 



48 llis . hydra ted lime, 2 



May 



93 



Whole <. 



0.13 



0.90 



0.40 



2.7 



0.014 



0.042 



85.3 



105.3 





lbs. lead arsenate 







Pulp.... 



.06 



.40 



.20 



1.4 



.005 



.016 



85.8 







(powder). 







Skin.... 



.42 



2.60 



1.20 



7.3 



.009 



.026 



83.6 







2 lbs. lead arseiiate(pow- 



May 



26 























der), 32 Ibs.hydrated 



























lime, 16 lbs. sulphur. 



























10 lbs. sulphur, 34 lbs. 



July 



10 























hvdrated lime. 

























23197 2 



40 lbs. hydrated lime, 



May 



93 



Whole < . 



.18 



1.30 



.40 



2.8 



.018 



.040 



85.7 



100.5 





4 lbs. lead arsenate 







Pulp.... 



.08 



.60 



.10 



. 7 



.006 



.008 



86.0 







(powder). 







Skin 



.61 



4.00 



1.60 



10.4 



.012 



.032 



84.6 







32 lbs. sulphur, 4 lbs. 



May 



26 























lead arsenate (powder) , 



























14 lbs. hydrated lime. 



























32 lbs. sulphur, 18 lbs. 



July 



10 























hydrated lime. 

























23198 2 



44 lbs. hydrated lime, 



May 



93 



Whole <. 



.25 



1.80 



.80 



5.7 



.024 



.076 



85.9 



95.2 





6 lbs. lead arsenate 







Pulp.... 



.08 



.60 



.20 



1.4 



.006 



.015 



86.1 







(powder). 







Skin.... 



.90 



6.10 



3.00 



20.4 



.018 



.061 



85.3 







44 lbs. sulphur, 6 lbs. 



May 



26 























lead arsenate (powder). 



























Sulphur alone 



July 



10 





















23199 2 



1 lb. lead arsenate (pow- 



May 



93 



Wholes 



.20 



1.50 



.30 



2.2 



.020 



.029 



86.2 



98.0 





der), 50 galls, water. 







Pulp.... 



.08 



.60 



.10 



.8 



.007 



.008 



86.7 







50 galls, solf-boiledlime- 



May 



26 



Skin.... 



.66 



4.20 



1.10 



7.0 



.013 



.021 



84.2 







sulphur, 1 lb. lead ar- 



























senate (powder). 



























Self-boiled lime-sulphur. 



July 



10 





















23200 2 



Check (unsprayed) 







Wholes. 

 Pulp.... 



.12 

 .07 



.90 

 .50 



.0 

 .0 



.0 

 .0 



.010 

 .005 



.0 

 .0 



86.7 

 87.0 



83.6 





















Skin 



.29 



2.00 



.0 



.0 



.005 



.0 



85.3 





23201 2 



78 lbs. terra alba, 32 lbs. 



May 



93 



Whole*. 



.13 



1.00 



.0 



.0 



.012 



.0 



86.5 



92.2 





sulphur. 







Pulp.... 



.02 



.20 



.0 



.0 



.001 



.0 



87.0 







Do 



May 

 July 



26 

 10 



Skin.... 



.63 



4.00 



.0 



.0 



.011 



.0 



84.3 







Do 





232022 



78 lbs. hydrated lime, 



May 



93 



Whole < . 



.10 



.80 



.0 



.0 



.009 



.0 



86.7 



88:4 





32 lbs. sulphur. 







Pulp.... 



.09 



.70 



.0 



.0 



.006 



.0 



87.1 







Do 



May 



26 



Skin 



.14 



.90 



.0 



.0 



.003 



.0 



85.0 







Do 



July 



10 





















232032 



10 lbs. lead arsenate 



May 



93 



Whole * . 



.13 



.90 



.30 



2.1 



.013 



.030 



85.4 



101.8 





(powder), 90 lbs. hy- 







Pulp.... 



.08 



.60 



.20 



1.4 



.007 



.017 



85.8 







drated lime. 







Skin.... 



.35 



2.10 



.70 



4.4 



.006 



.013 



84.2 







Do 



May 

 May 



26 





















232042 



8 lbs. sulphur, 3 ozs. glue 



93 



Whole <- 



.10 



.70 



.30 



2.0 



.009 



.025 



85.1 



86.0 





(used in water to wet 







Pulp.... 



.04 



.30 



.10 



.7 



.003 



.007 



85.4 







sulphur), 8 lbs. hy- 







Skin 



.34 



2.10 



1.00 



6.3 



.006 



.018 



84.1 







drated lime, lib. lead 



























arsenate (powder), 50 



























galls, water. 



























Do 



May 

 July 



26 

 10 























8 lbs. sulphur,3ozs. glue 







(used in water to wet 



























sulphur), 8 lbs. hv- 



























drated lime, 50 galls. 



























water. 

























1 Where no mention is made of water in the formula the material was applied as dust. 

 « Delaware variety, harvested Au^. 12-18, Berlin, Md. 

 • As shucks fell. < Without stones. 



