A foregone conclusion

As Don Ippolito passed down the long narrow calle or footway leading from the Campo San Stefano to the Grand Canal in Venice, he peered anxiously about him: now turning for a backward look up the calle, where there was no living thing in sight but a cat on a garden gate; now running a quick eye along the palace walls that rose vast on either hand and notched the slender strip of blue sky visible overhead with the lines of their jutting balconies, chimneys, and cornices; and now glancing toward the canal, where he could see the noiseless black boats meeting and passing.