their most striking illustrations, their happiest remarks; because he does not see their value or feel how pregnant they are. The only thing that appeals to him is what is shallow and insipid.
It often happens that an old and excellent book is ousted by new and bad ones, which, written for money, appear with an air of great pretension and much puffing on the part of friends. In science a man tries to make his mark by bringing out something fresh. This often means nothing more than that he attacks some received theory which is quite correct, in order to make room for his own false notions. Sometimes the effort is successful for a time; and then a return is made to the old and true theory. These innovators are serious about nothing but their own precious self: it is this that they want to put forward, and the quick way of doing so, as they think, is to start a paradox. Their sterile heads take naturally to the path of negation; so they begin to deny truths that have long been admitted--the vital power, for example, the sympathetic nervous system, _generatio equivoca_, Bichat's distinction between the working of the passions and the working of intelligence; or else they want us to return to crass atomism, and the like. Hence it frequently happens that _the course of science is retrogressive._
To this class of writers belong those translators who not only translate their author but also correct and revise him; a proceeding which always seems to me impertinent. To such writers I say: Write books yourself which are worth translating, and leave other people's works as they are!
The reader should study, if he can, the real authors, the men who have founded and discovered things; or, at any rate, those who are recognized as the great masters in every branch of knowledge. Let him buy second-hand books rather than read their contents in new ones. To be sure, it is easy to add to any new discovery--_inventis aliquid addere facile est_; and, therefore, the student, after well mastering the rudiments of his subject, will have to make himself acquainted with the more recent additions to the knowledge of it. And, in general, the following rule may be laid down here as elsewhere: if a thing is new, it is seldom good; because if it is good, it is only for a short time new.
What the address is to a letter, the title should be to a book; in other words, its main object should be to bring the book to those amongst the public who will take an interest in its contents. It should, therefore, be expressive; and since by its very nature it must be short, it should be concise, laconic, pregnant, and if possible give the contents in one word. A prolix title is bad; and so is one that says nothing, or is obscure and ambiguous, or even, it may be, false and misleading; this last may possibly involve the book in the same fate as overtakes a wrongly addressed letter. The worst titles of all are those which have been stolen, those, I mean, which have already been borne by other books; for they are in the first place a plagiarism, and secondly the most convincing proof of a total lack of originality in the author. A man who has not enough originality to invent a new title for his book, will be still less able to give it new contents. Akin to these stolen titles are those which have been imitated, that is to say, stolen to the extent of one half; for instance, long after I had produced my treatise _On Will in Nature_, Oersted wrote a book entitled On Mind in Nature.
A book can never be anything more than the impress of its author's thoughts; and the value of these will lie either in _the matter about which he has thought_, or in the form which his thoughts take, in other words, _what it is that he has thought about it._
The matter of books is most various; and various also are the several excellences attaching to books on the score of their matter. By matter I mean everything that comes within the domain of actual experience; that is to say, the facts of history and the facts of nature, taken in and by themselves and in their widest sense. Here it is the thing treated of, which gives its peculiar character to the book; so that a book can be important, whoever it was that wrote it.
But in regard to the form, the peculiar character of a book depends upon the person who wrote it. It may treat of matters which are accessible to everyone and well known; but it is the way in
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