114 EXPERIMENT STATION RECORD. 



Chemists, was read by H. W. Wiley, and tlie appointment of a dele- 

 gate to the next meeting- of this association was authorized. 



INSECTICIDES AND FUNGICIDES. 



The report on this subject was read by the referee, J. K. Haywood. 

 The work was directed chiefly toward testing- methods of analysis col- 

 lected from various sources and published as Circular 10 of the Bureau 

 of Chemistry-. Samples were sent to a number of analysts and results 

 were received from 9 upon Paris green and London purple, 4 upon 

 copper carbonate, 4 upon potassium cyanid, 4 upon soda lye, 2 upon 

 whale-oil soap, 4 upon formalin, and 3 upon tobacco extract, which, 

 with the conmients of the anal3^sts, were reported in detail. Based 

 upon the work, the referee recommended the adoption of method I 

 for total arsenious oxid in Paris green, given in the circular referred 

 to above as one of the official methods, and also the further testing- of 

 nearly all the other methods given in the circular except methods II 

 (by weighing the residue) and III for formaldehyde, which were 

 recommended to be dropped. 



Details of several of the methods were discussed and one or two 

 points brought up were referred to the referee for further stud3\ 

 H. W. Wiley suggested that every unnecessary detail ])e dropped 

 from methods. J. K. Haywood spoke of the effect of free arsenious 

 oxid in Paris green upon foliage, stating that in experiments it was 

 observed that the presence of 7 per cent was injurious to apples and 

 pears and 4 per cent to young peach trees, and that Improperly pre- 

 pared Paris green and samples in which the Paris green was in a very 

 fine condition also injured the foliage. 



ASH. 



The report on this subject was submitted by the referee, G. S. Fraps. 

 Methods for the determination of sulphur and potash in plants were 

 further studied. Results by different analysts on corn bran and cotton- 

 seed meal by the nitric acid method and the nitric acid method, modi- 

 fied by the substitution of calcium acetate for potassium nitrate, showed 

 no satisfactory agreement. The results of the nitric acid method were 

 considered too low. Slightly higher figures were obtained for potash 

 l)y charring and extracting than by ignition with sulphuric acid. The 

 forms in which sulphur exists in plants and the determination of sul- 

 phates were discussed, the literature along these lines being reviewed. 

 Sulphur as sulphates was found in oats, crimson clover, cotton-seed 

 meal, and cowpea vines, and absent in corn, green millet, timothy hay, 

 corn silage, and peanuts. In the determination of chloriu three 

 methods were tested, namely, ignition with calcium acetate, fusion 

 with sodium hydroxid, and ignition with sodium carbonate. The cal- 

 cium acetate method gave low results. The sodium carbonate method 



