co. ( 37 md. , 537 , 564 ) , the supreme court of the state of maryland , discussing the question before us , said : `` to justify the exercise of this extreme power ( eminent domain ) where the legislature has left it to depend upon the necessity that may be found to exist , in order to accomplish the purpose of the incorporation , as in this case , the party claiming the right to the exercise of the power should be required to show at least a reasonable degree of necessity for its exercise .