For the fullest account of Scaliger’s very numerous works, we refer to Niceron, ‘Mémoires pour servir à l’histoire des Hommes Illustres,’ vol. 23. The earliest of them, ‘Conjectanea in Varronem,’ was composed when the author was only twenty years old. Another of his earlier productions was an edition of ‘Lycophron,’ with a version into Latin iambics, for which he has obtained the sarcastic commendation of having by a _tour de force_ of which no other person was capable, made the translation quite as unintelligible as the original. He translated the ‘Ajax’ of Sophocles, in the same metre. He has commented upon Cæsar, Catullus, Tibullus and Propertius, Persius, Ausonius, Manilius, the tragedies of Seneca, Theocritus, Bion and Moschus, &c. His original works contain treatises on astronomy, mathematics, numismatics, and chronology, and various departments of philological and antiquarian research. He flattered himself that he had discovered and propounded in his ‘Cyclometrica Elementa duo; nec non Mesolabium;’ a method for the quadrature of the circle: but the fallacy which deceived him was soon exposed by Vieta and others. Scaliger’s most important and most original work is that ‘De Emendatione Temporum, 1583,’ which merits especial praise, as being the first attempt to produce a system of chronology. It contains a vast quantity of learning, in the collection of which the author was greatly assisted by his knowledge of the Oriental languages, as well as of Greek and Latin. That he is often in error is, in this instance, hardly a blemish upon his merited fame: in so vast an untrodden field it was impossible to avoid mistakes. And doubtless this would have been willingly conceded, but for his presumptuous, uncharitable, and abusive manner of treating the mistakes of others: those who had suffered from his venomous tongue, of course were ready and eager to revenge themselves at the first opportunity. In the second and third editions he made considerable alteration. Petavius, another eminent chronologer of the same age, who had the advantage, it is to be recollected, of all that Scaliger had done before him, finds great fault with the ‘De Emendatione;’ but he allows that “the learning diffused through it, the immense variety of topics which it embraces, the novelty of the subject, and the decided tone of the author, procured for him a very high reputation.” It was in this that Scaliger propounded the Julian period, as a sort of common measure for the various eras; but it never became general, and has fallen into complete disuse. The same Petavius, in speaking of Scaliger’s letters, which are full of curious matter, easy and familiar, and brilliant without affectation (Epistolæ Omnes, 1627, published by Heinsius), declared, that if he had then seen these “divine letters,” he would never have attacked the author of them. Scaliger’s poems (Poemata Omnia, collected and published in 1615) have