The known reading public--the minority already referred to--are easily discovered and classified. There is the religious public, with booksellers and literature of its own, which includes reviews and newspapers as well as books. There is the public which reads for information, and devotes itself to Histories, Biographies, Essays, Treatises, Voyages and Travels. There is the public which reads for amusement, and patronises the Circulating Libraries and the railway book-stalls. There is, lastly, the public which reads nothing but newspapers. We all know where to lay our hands on the people who represent these various classes. We see the books they like on their tables. We meet them out at dinner, and hear them talk of their favourite authors. We know, if we are at all conversant with literary matters, even the very districts of London in which certain classes of people live who are to be depended upon beforehand as the picked readers for certain kinds of books. But what do we know of the enormous outlawed majority--of the lost literary tribes--of the prodigious, the overwhelming three millions? Absolutely nothing. I myself--and I say it to my sorrow--have a very large circle of acquaintance. Ever since I undertook the interesting task of exploring the Unknown Public, I have been trying to discover among my dear friends and my bitter enemies (both alike on my visiting list), a subscriber to a penny-novel-journal--and I have never yet succeeded in the attempt. I have heard theories started as to the probable existence of penny-novel-journals in kitchen dressers, in the back parlours of Easy Shaving Shops, in the greasy seclusion of the boxes at the small Chop Houses. But I have never yet met with any man, woman, or child who could answer the inquiry, "Do you subscribe to a penny journal?" plainly in the affirmative, and who could produce the periodical in question. I have learnt, years ago, to despair of ever meeting with a single woman, after a certain age, who has not had an offer of marriage. I have given up, long since, all idea of ever discovering a man who has himself seen a ghost, as distinguished from that other inevitable man who has had a bosom friend who has unquestionably seen one. These are two among many other aspirations of a wasted life which I have definitely resigned. I have now to add one more to the number of my vanished illusions. In the absence, therefore, of any positive information on the subject, it is only possible to pursue the present investigation by accepting such negative evidence as may help us to guess with more or less accuracy, at the social position, the habits, the tastes, and the average intelligence of the Unknown Public. Arguing carefully by inference, we may hope, in this matter, to arrive at something like a safe, if not a satisfactory, conclusion.