Many of the points touched upon have provoked endless disputations which are not likely soon to be settled. Indeed there is hardly any line of study one can take up in connection with Rome which does not bristle with controversies; and a feeling of perplexity and uncertainty continually haunts one in regard to most of the subjects. It is not only in the vague field of the early traditions of the city, and of the medieval traditions of the Church, that this feeling oppresses one; it exists everywhere, even in the more solid and assured world of Roman art, literature, and history. Where it is so difficult to arrive at settled convictions, I may be pardoned if I have expressed views that are open to reconsideration.
I am aware of the disadvantages connected with thus collecting together a number of separate papers, instead of writing a uniform treatise upon one continuous subject. The picture formed by their union must necessarily have much of the artificiality and clumsiness of the mosaic as compared with the oil or water-colour painting. But only in this form could I have brought together such a great variety of important things. And though I cannot hope that the inherent defect of the mosaic will be compensated by its permanence--for books of this kind do not last--yet it will surely serve some good purpose to have such a collocation of facts regarding a place whose interest is ever varying and never dying.
The personal element is almost entirely confined to the first chapter, which deals on that account with more familiar incidents than the others. Twelve years have elapsed since my memorable sojourn in Rome; and many changes have occurred in the Eternal City since then. I have had no opportunity to repeat my visit and to add to or correct my first impressions, desirable as it might be to have had such a revision for the sake of this book. I duly drank of the water of Trevi the night before I left; but the spell has been in abeyance all these years. I live, however, in the hope that it has not altogether lost its mystic power; and that some day, not too far off, I may be privileged to go over the old scenes with other and larger eyes than those with which I first reverently gazed upon them. It needs two visits at least to form any true conception of Rome: a first visit to acquire the personal interest in the city which will lead at home to the eager search for knowledge regarding it from every source; and then the second visit to bring the mind thus quickened and richly stored with information to bear with new comprehension and increased interest upon the study of its antiquities on the spot.