Such terms as “accidental coincidence,” “identity of thought,” “unconscious cerebration” (in absorbing the expressions of another), were doubtless used in these earlier as in the later days of literature to explain certain suspicious cases of “parallelisms” or similarities. In fact, at least one Greek author, the sophist Aretades, wrote a volume, unfortunately lost, on the similarity or identity of thought creations.[32]

Clement gives some examples of borrowings or appropriations on the part of writers and orators, and his list is so considerable as to leave the impression that the public opinion to which he refers was either not very active in discovering the practice, or was not a little remiss in characterizing and in condemning it. Isocrates copies an entire oration from Gorgias; Æschines makes free use in his discourses of those of Lysias and Andocides. Even Demosthenes, the chief of orators, occasionally yielded to the temptation; and among other instances, Clement cites extracts from orations against Aphobos and Pantænetos which are identical with passages in the Discourses on Ciron by the old instructor of Demosthenes, Isæus.

Rozoir tells us that an anonymous work of six volumes (rolls) was published under the title Passages in the Writings of Menander which are Not the Work of Menander, and that Philostrates of Alexandria accused Sophocles of having pillaged Æschylus, Æschylus of having permitted himself to draw too much inspiration from Phrynichus, and, finally, Phrynichus of having taken his material from the writers who preceded him. Such charges become, of course, too sweeping to be pertinent, and can probably in large part be dismissed with the conclusion that each generation of writers ought to familiarize itself with the work of its predecessors, and may often enough with propriety undertake the reinterpretation for new generations of readers of themes similar to those which have interested their fathers and grandfathers.

One evidence that the subject of plagiarism was a matter which in later days engaged public attention is given by the Fable of Æsop on the Jay masquerading in the plumes of the Peacock.

Clement points out that in connection with the fierce competition between the poets of Athens for dramatic honors, no means were neglected by the friends of each writer to bring discredit upon the productions of his rivals, and that very many of the charges of plagiarism can be traced to such an incentive. Aristophanes, who amused himself by utilizing for his comedies the strifes between his literary contemporaries, puts into the mouth of Euripides, whom he makes one of the characters in The Frogs, the following biting words, addressed to Æschylus:

“When I first read over the tragedy which you placed in my hands, I found it difficult and bombastic; I at once made a severe condensation, freeing the play from the weight of rubbish with which you had overloaded it; I then enlivened it with bright sayings, with pointed philosophic subtleties and with an abundance of brilliant witticisms drawn from a crowd of other books; and finally I added some pithy monologues, which are in the main the work of Ctesiphon.”[33]

In the same comedy, Æschylus is made to accuse Euripides of having carried on literary free-booting in every direction. Further on, Bacchus, in expressing his admiration for some striking thought expressed by Euripides, asks whether it is really his or Ctesiphon’s, and the tragedian frankly admits that the credit for the idea properly belongs to the latter. Clement concludes that there must have been foundation for the raillery of the comedian, and refers, in this connection, to the remarks of Plato that if one wished to examine the philosophy of Anaxagoras, the simplest course was to read the tragedies of Euripides, the choruses of which reproduced faithfully the teachings of the philosopher. Aristophanes, while scoffing sharply at the misdeeds of others, was himself not beyond criticism, being charged with having made free use of the comedies of Cratinus and Eupolis.[34]

The philosophers and historians appear to have been little more conscientious than the poets in their literary standard. The historian Theopompus included, without credit, in the eleventh book of his Philippics a whole harangue of Isocrates, and with a few changes of names and places, he was able to make use of passages from Androtion and Xenophon. His appropriations were so considerable that they were collected in a separate volume to which was given the fitting title of The Hunters.[35] Lysimachus wrote a book entitled The Robberies of Ephorus. Timon, in some lines preserved by Aulus Gellius, charges Plato with having obtained from a treatise of the Pythagorean philosopher Philolaus the substance of his famous dialogue the Timæus.[36] The lines, from the version of Clement, read as follows: “You also, Plato, being ambitious to acquire knowledge, first purchased for a great sum a small book, and then with its aid proceeded yourself to instruct others.”

Even our moral friend Plutarch does not escape from the general charge of borrowing from others.

“In reading,” says Rozoir, “the text of many of the Lives, one cannot but be struck with the very great differences of style and of forms of expression, differences so marked, that it is difficult to avoid the conclusion that many portions are extracts taken literally and without credit, from other authors.”[37]