Dr. Arthur seems to have been the first to test the efflcacy of formalin iu combatiug the potato scab. It is not very expensrve and can be bought by the fluid ounce at most drug stores. The following is his description of the method oí treatrnent, which is quite simple : Eight ounces of the formalin are added to 15 gallons of -water, and in this the seed potatoes are soaked for two hours. After taking from the bath they can be cut and plauted as usual, either at once or after some time. Formalin is not corrosive, and so can be used in any kind of vessel, and not being poisonous there are no particular precautions to be observed. It does, however, make the hands smart if there are any raw spots, aud the fumes irritate the eyes and throat.