2 26 Minnesota Plant Diseases. 



perature of the water is falling, pour in hot water from kettle 

 of boiling water until the right degree is maintained. If 

 the temperature should rise higher than 133°, add a little cold 

 water. In all cases the water should be well stirred whenever 

 any of a dififerent temperature is added. The basket of seed 

 should very shortly after its immersion be lifted and drained, 

 and then plunged and agitated in the manner described above. 

 This operation should be repeated six or eight times during the 

 immersion, which should be continued ten minutes. In this 

 way every portion of the seed will be subjected to the action of 

 the scalding water. 



"After removing the grain from the scalding water, spread 

 on a clean floor or piece of canvas to dry. The layer of grain 

 should not be over three inches thick. 



"The important precautions to be taken are as follows: (i) 

 Maintain the proper temperature of the water (132° to 133" F.), 

 in no case allowing it to rise higher than 135° F. ; (2) see that 

 the volume of scalding water is much greater (at least six or 

 eight times) than that of the seed treated at any one time ; (3) 

 never fill the basket or sack containing the seed entirely full, 

 but always leave room for the grain to move about freely; (4) 

 leave the seed in the second vessel of water ten minutes." 

 [Yearbook U. S. Dept. Ag., 1894.] 



This method is known to be very effective if carefully fol- 

 lowed in all details. If due care and precaution are not taken, 

 not only will no good result but the efifect of the treatment may 

 even be harmful. In respect to the care necessary in handling, 

 the formalin method is of greater advantage since less skill in 

 the operation is required. 



Corrosive sublimate. 



Corrosive sublimate 2 oz. 



Water 15 gallons. 



Dissolve the corrosive sublimate in two gallons of hot water, 

 then dilute to fifteen gallons, allowing the same to stand five or 

 six hours, during which time thoroughly agitate the solution 

 several times. Place the seed potatoes in a sack and immerse 

 in the solution for one and a half hours. Corrosive sublimate is 

 very poisonous, consequently care should be taken in handling it, 

 and the treated potatoes should not be fed to stock. The 



