1888.] 



PUBLIC DOCUMENT — No. 33. 



147 



Scabby potatoes, treated with a solution of 

 potassium chloride (muriate of potash). 



Scabby potatoes, without i^revious treatment. 



Scabby potatoes, ti'eated with a solution of 

 carbolic acid. 



Smooth, healthy potatoes, not treated. 



Scabby potatoes, treated with copper sul- 

 phate (blue copperas). 



Scabby potatoes, not treated. 



The young plants made their appearance on all the plats, 

 except No. 9, eTune 1 ; those on No. 9 appeared eight or ten 

 days later. The entire crop looked uniformly well. The 

 vines dried up on all plats at about the same time. The 

 crop was harvested with the following results : — 



Beauty of Hebron. 



A careful consideration of these results seems to show 

 that a certain condition of the soil has been the leading 

 cause for the origin and propagation of the scab ; for scabby 

 seed potatoes have produced healthy, smooth tubers, both 

 with and without any special previous treatment, — see 

 Plats 1, 2, 7 and 8. On the other hand, it is not without 

 interest to notice that Plats 1, 3 and 7 have furnished us 

 with some of the best potatoes we have raised during the 

 past season. 



