“ When the period arrived when the company was no longer willing to so act, and stood upon its rights as it understood them, naturally the city stood upon its asserted rights, and thus the parties were at arm's length, disputing their respective rights. ”

“ We find, however, nothing in the contract to support the construction that it required the payment to be made in foreign current money circulating in the island at the time the contract was made, instead of money of that character circulating at the time the payments were to be made. The general rule, under both the common and the civil law, is that, in the absence of a stipulation to the contrary, the character of money which is current at the time fixed for performance of a contract is the medium in which payments may be made. ”

“ The court, in its general charge, in the fullest manner instructed the jury that, as the medium of payment required by the contract was foreign current money, payment in that money extinguished simply the amount paid in foreign money, unless it was found that the minds of the parties had met on an agreement engendering an entirely new contract, substituting Porto Rican money for foreign currency. ”