THE Delaware and Hudson Canal Company was held liable in the trial court, whose judgment was affirmed by the Supreme Court of Pennsylvania, for the amount of a tax of three mills upon bonds originally issued and sold by the company in the State of New York, but held in the year 1890 by residents of Pennsylvania. The tax was imposed upon the bondholders. The liability of the company was maintained because of the failure of its treasurer, when paying interest in the city of New York, to deduct therefrom the amount of the tax and pay the same into the state treasury of Pennsylvania. The company, which is a corporation of the State of New York, constructed a portion of its improvements within the limits of Pennsylvania, in pursuance of certain statutes of that State defining the terms and conditions upon which they might be so constructed. In its original appeal and in its assignment of errors the company denied the authority of the State of Pennsylvania to impose upon it or its treasurer, when paying interest in New York, the duty of assessing and collecting this Pennsylvania state tax, and further urged that the imposition upon it of this duty as a further condition to its doing business in Pennsylvania worked an impairment of the obligation of the contract contained in the original legislation, in pursuance of which it entered the State and constructed its works.