90 



EXPERIMENT STATION. 



[Jan. 



The experiments, on the whole, were very unsatisfactory, 

 and no dednctions of any importance could be made. 



The experiments of the season of 1909 were planned in the 

 same manner, but owing to other causes over which we had no 

 control the crop was lost before the examination could be made. 



In 1910 the exj^eriment as planned and carried out was as 

 follows : — 



Table II. — Plan of Potato Scab Experiments, 1910. 



Pot 

 Num- 

 ber. 



Substance used. 



Amount used. 



Formalin, 1-100, 



Formalin, 1-200, 



Formalin, 1-300, 



Formalin, 1-400, 



Potassium permanganate, 1-100, 



Potassium permanganate, 1-300, 



Potassium permanganate, 1-400, 



Potassium permanganate, 1-500, 



Sulfuric acid, 1-200, 



Sulfuric acid, 1-400, 



Sulfuric acid, 1-600, 



Sulfuric acid, 1-800, 



Sulfur 



Sulfur 



Sulfur, ..... 



114 cubic centimeters. 



57 cubic centimeters. 



38 cubic centimeters. 



28.5 cubic centimeters. 



57 grams. 



38 grams. 



28.5 grams. 



23 grams. 



57 cubic centimeters. 



28.5 cubic centimeters. 



19 cubic centimeters. 



14.2 cubic centimeters. 



50 grams. 



100 grams. 



200 grams. 



Upon examination it was found that the check pots were prac- 

 tically all scabby. This was taken as a basis of 100 per cent, 

 scab, and the results from the various treatments estimated in 

 relation to this basis. 



Pots N'os. 1, 3, 5 and Y, which were treated with formalin, 

 showed the presence of scab as follows : in pot No. 1 the potatoes 

 had only 10 per cent, scab, as against 30 per cent for pot No. 

 3, 24 per cent, for pot No. 5, and 10 per cent, for pot No. 7. 



In the pots treated with potassium permanganate no yield 

 was obtained except in one case and one check, and here the 

 potatoes were about 50 per cent, scabby in both cases. 



