IN the preface to “Alps and Sanctuaries” I apologised for passing over Varallo-Sesia, the most important of North Italian sanctuaries, on the ground that it required a book to itself. This book I will now endeavour to supply, though well aware that I can only imperfectly and unworthily do so. To treat the subject in the detail it merits would be a task beyond my opportunities; for, in spite of every endeavour, I have not been able to see several works and documents, without which it is useless to try and unravel the earlier history of the sanctuary. The book by Caccia, for example, published by Sessali at Novara in 1565, and reprinted at Brescia in 1576, is sure to turn up some day, but I have failed to find it at Varallo, Novara (where it appears in the catalogue, but not on the shelves), Milan, the Louvre, the British Museum, and the Bodleian Library. Through the kindness of Sac. Ant. Ceriani, I was able to learn that the Biblioteca Ambrosiana possessed what there can be little doubt is a later edition of this book, dated 1587, but really published at the end of 1586, and another dated 1591, to which Signor Galloni in his “Uomini e fatti celebri di Valle-Sesia” (p. 110) has called attention as the first work ever printed at Varallo. But the last eight of the twenty-one years between 1565 and 1586 were eventful, and much could be at once seen by a comparison of the 1565, 1576, and 1586 [1587] editions, about which speculation is a waste of time while the earlier works are wanting. I have been able to gather two or three interesting facts by a comparison of the 1586 and 1591 editions, and do not doubt that the date, for example, of Tabachetti’s advent to Varallo and of his great Calvary Chapel would be settled within a very few years if the missing books were available. Another document which I have in vain tried to see is the plan of the Sacro Monte as it stood towards the close of the sixteenth century, made by Pellegrino Tibaldi with a view to his own proposed alterations. He who is fortunate enough to gain access to this plan—which I saw for a few minutes in 1884, but which is now no longer at Varallo—will find a great deal made clear to him which he will otherwise be hardly able to find out. Over and above the foregoing, there is the inventory drawn up by order of Giambattista Albertino in 1614, and a number of other documents, to which reference will be found in the pages of Bordiga, Galloni, Tonetti, and of the many others who have written upon the Val Sesia and its history. A twelve months’ stay in the Val Sesia would not suffice to do justice to all the interesting and important questions which arise wholesale as soon as the chapels on the Sacro Monte are examined with any care. I shall confine myself, therefore, to a consideration of the most remarkable features of the Sacro Monte as it exists at present, and to doing what I can to stimulate further study on the part of others.