Show cause of black heart the usual causes of black blach heart are piling potatoes too deep or putting them in bins lehere where there lias has been no circulation of air and maintaining too high u i temperature in the storage place where potatoes anre kept at temperatures belo below v 45 degrees fail fahrenheit they can be piled as deep as a feet without lunger danger of injury but whet where e the temperature us As 11 likely kelp to be 50 degrees or above as la Is the ilie case in some cellars it Is not safe to pile them more than S 3 feet deep it if they are to be kept longer than three or four weeks |