Some books (using the word _book_ in the sense of any literary work) are for all time--Homer, Virgil, Dante, Milton, Shakespeare; some books are for their own time only; some books are for their own time and a limited period afterwards. But whatever be the vitality of a book, no matter to which of these classes it belongs, there is no doubt that it belongs in the first instance to its own time, and cannot help being to some degree a reflection of the spirit of the age in which it was produced. This means that not only may the book be used as an historical document, as a means of catching the spirit of its age, but that, conversely, a study of the epoch at which it was produced cannot fail to illuminate to a greater or less degree the meaning of the book. Critics like Taine and Sainte-Beuve looked on books as primarily historical documents. Behind the book one looked for the man, behind the man one found the innumerable circumstances which went to mould his personality. In this way of looking at things the individual becomes of comparatively small importance; he is interesting mainly because he is a type of his age; his book is interesting because it reveals the type. Much can be said for this deterministic way of looking at literature, and some excellent results have been produced by Taine's style of criticism, but few critics of to-day would look on it with favour. To-day, the book is of primary importance; the man and the age are studied that they may throw light on the book. However exaggerated the historical method, as carried out by Taine, may appear, I think we must admit that in a modified form it may be of very great value. We all know that a literary work is flavoured by the personality of the writer. From our experience as teachers we learn that we can read a personal document more sympathetically if we know who wrote it. I have sometimes commenced to read an essay under the impression that it was written by a student A, and have been annoyed at certain ways of thinking and methods of expression that seemed to me forced and unnatural; I have turned to the back of the essay, seen the name of the writer, discovered my mistake, and re-read the essay with the personality of B instead of A at the back of my mind, and then the essay seemed to me to go smoothly, and to be characteristic of the writer.