POTATOES 281 



of water. Either poison can be added to Bordeaux mix- 

 ture which is the remedy for the potato diseases. 

 Methods of treating the potato scab will be described in 

 the practical exercises. 



Practical Exercises 

 1. Treating Seed Potatoes to Prevent Scab 



The day before the lesson is to be given, the teacher 

 should ask some pupils to bring about a peck of the 

 scabbiest potatoes that can be found. The teacher should 

 see that the other materials are provided for the lesson. 



Place the potatoes in a burlap sack. Into a tub or 

 barrel pour five gallons of water. To this add about 

 one-sixth of a pint of formalin. This can be purchased 

 at any drug store at 40 cents a pint. Place the sack of 



FIG. 86. A GOOD POTATO A SCABBY POTATO 



potatoes in the tub of formalin solution. Allow them 

 to soak one and one-half hours. 



(Experimental work of this lesson will have to end 

 here. If there is a school garden, the work as outlined 

 below should be continued at school ; if none the teacher 

 should fully explain the rest, and call for volunteer 

 pupils to complete the experiment at home and report 

 upon i 1 :.) 



Remove the potatoes from the solution, and cut into 

 pieces for planting. Cut the potato through the long 



