June, 1917.1 ARSENICAL RESIDUES AFTER SPRAYING. 61 



pared. These were of the same size as those just described and 

 were sprayed in the same manner, using 3 concentrations of 

 spray material, just described. 



Sixteen days elapsed between the time when the spray was 

 apphed and the time when the grass was cut and made into hay. 

 In this period there were heavy rains. 



Samples were submitted for analysis 3 months later. Two 

 samples showed no recoverable amount of the spray material. 

 The third sample showed a trace only. This sample was from 

 the plot which had received spray material made up at the rate 

 of 10 lbs. of arsenate of lead paste to 50 gallons of water. 



BIBLIOGRAPHY. 



1. Bailey, L. H. — Arsenite Under Sprayed Trees. N. Y. 



Cornell, Station Bull. No. 101, Sept. 1895, p. 578 (E. S. 

 R., Vol. 7, p. 879). Experiments to determine what be- 

 comes of the arsenic brought to the soil from sprayed trees 

 by rains and fallen leaves. 



2. Blyth, a. W.—" Poisons— Their Effects and Detection." 



London, 1906. 



3. Carlson, A. J. and Woelfel, A. — The Solubihty of White 



Lead in Human Gastric Juice, and its Bearing on the 

 Hygiene of the Lead Industries. American Journal of 

 Pubhc Health, Vol. Ill, No. 8, Aug. 3, 1913. From the 

 Hull Physiological Laboratory of the Chicago Universit3\ 



4. Fernald C. H. — Poisonous Doses of Insecticides. Mass. 



Hatch, Station Bull. No. 2, Oct. 1888, pp. 8-10. The 

 nature of different poisons used as insecticides. Doses of 

 each fatal to man and domestic animals. Directions for 

 treatment in case of poisoning. 



5. Formad, R. J. — The Effect of Smelter Fumes upon the Live 



Stock Industry in the Northwest. U. S. D. A., Bur. An. 

 Industry, Report 1908, pp. 237-268 (E. S. R.20,pp. 28-79). 

 Nature and cause of symptonis found among horses in the 

 vicinity of a smelter. Pathological findings on post mor- 

 tems. 



6. Carman, H.— Ky. Bull. No. 144, 1904, pp. 15-23 (E. S. R., 



Vol. 16, p. 892). Report of cases of supposed poisoning 

 from cabbage. Analyses of cabbages. 



