In a large city, this class of citizens is familiar to us in the streets. They are very courteous in their salutations; they have time enough to bow and take their hats off,--which, of course, no businessman can afford to do. Their beavers are smoothly brushed, and their boots well polished; all their appointments are tidy; they look the respectable walking gentleman to perfection. They are prone to habits,--they frequent reading-rooms,--insurance-offices,--they walk the same streets at the same hours,--so that one becomes familiar with their faces and persons, as a part of the street-furniture. There is one curious circumstance, that all city-people must have noticed, which is often illustrated in our experience of the slack-water gentry. We shall know a certain person by his looks, familiarly, for years, but never have learned his name. About this person we shall have accumulated no little circumstantial knowledge;--thus, his face, figure, gait, his mode of dressing, of saluting, perhaps even of speaking, may be familiar to us; yet who he is we know not. In another department of our consciousness, there is a very familiar name, which we have never found the person to match. We have heard it so often, that it has idealized itself, and become one of that multitude of permanent shapes which walk the chambers of the brain in velvet slippers in the company of Falstaff and Hamlet and General Washington and Mr. Pickwick. Sometimes the person dies, but the name lives on indefinitely. But now and then it happens, perhaps after years of this independent existence of the name and its shadowy image in the brain, on the one part, and the person and all its real attributes, as we see them daily, on the other, that some accident reveals their relation, and we find the name we have carried so long in our memory belongs to the person we have known so long as a fellow-citizen. Now the slack--water gentry are among the persons most likely to be the subjects of this curious divorce of title and reality,--for the reason, that, playing no important part in the community, there is nothing to tie the floating name to the actual individual, as is the case with the men who belong in any way to the public, while yet their names have a certain historical currency, and we cannot help meeting them, either in their haunts, or going to and from them.