For mere reading I suppose one book is pretty much as good as another; but the choice of a desk-book is a more serious matter. It must be neither too thick nor too thin; it must be large enough to make a substantial support; it must be strongly bound so as not to yield or give; it must not be too troublesome to carry backwards and forwards; and it must live on shelf C, D, or E, so that there need be no stooping or reaching too high. These are the conditions which a really good book must fulfil; simple, however, as they are, it is surprising how few volumes comply with them satisfactorily; moreover, being perhaps too sensitively conscientious, I allowed another consideration to influence me, and was sincerely anxious not to take a book which would be in constant use for reference by readers, more especially as, if I did this, I might find myself disturbed by the officials. For weeks I made experiments upon sundry poetical and philosophical works, whose names I have forgotten, but could not succeed in finding my ideal desk, until at length, more by luck than cunning, I happened to light upon Frost's "Lives of Eminent Christians," which I had no sooner tried than I discovered it to be the very perfection and _ne plus ultra_ of everything that a book should be. It lived in Case No. 2008, and I accordingly took at once to sitting in Row B, where for the last dozen years or so I have sat ever since. The first thing I have done whenever I went to the Museum has been to take down Frost's "Lives of Eminent Christians" and carry it to my seat. It is not the custom of modern writers to refer to the works to which they are most deeply indebted, and I have never, that I remember, mentioned it by name before; but it is to this book alone that I have looked for support during many years of literary labour, and it is round this to me invaluable volume that all my own have page by page grown up. There is none in the Museum to which I have been under anything like such constant obligation, none which I can so ill spare, and none which I would choose so readily if I were allowed to select one single volume and keep it for my own.