Speculation on language at this period revealed an equally determined intellectualist attitude. Grammar was held to be an exact science, and grammatical variations to be explainable by the ellipse, by abbreviation, and by failure to grasp the typical logical form. In France, with Arnauld (1660), we have the rigorous Cartesian intellectualism; Leibnitz and Locke both, speculated upon this subject, and the former all his life nourished the thought of a universal language. The absurdity of this is proved in this volume.
A complete change of the Cartesian system, upon which Leibnitz based his own, was necessary, if speculation were ever to surpass the Leibnitzian aesthetic. But Wolff and the other German pupils of Leibnitz were as unable to shake themselves free of the all-pervading intellectualism as were the French pupils of Descartes.
Meanwhile a young student of Berlin, named Alexander Amedeus Baumgarten, was studying the Wolffian philosophy, and at the same time lecturing in poetry and Latin rhetoric. While so doing, he was led to rethink and pose afresh the problem of how to reduce the precepts of rhetoric to a rigorous philosophical system. Thus it came about that Baumgarten published in September 1735, at the age of twenty-one, as the thesis for his degree of Doctor, an opuscule entitled, _Meditationes philosophicae de nonnullis ad poèma pertinentibus_, and in it we find written _for the first time_ the word "Aesthetic," as the name of a special science. Baumgarten ever afterwards attached great importance to his juvenile discovery, and lectured upon it by request in 1742, at Frankfort-on-the-Oder, and again in 1749. It is interesting to know that in this way Emmanuel Kant first became acquainted with the theory of Aesthetic, which he greatly altered when he came to treat of it in his philosophy. In 1750, Baumgarten published the first volume of a more ample treatise, and a second part in 1762. But illness, and death in 1762, prevented his completing his work.
What is Aesthetic for Baumgarten? It is the science of sensible knowledge. Its objects are the sensible facts (_aisthaeta_), which the Greeks were always careful to distinguish from the mental facts (_noaeta_). It is therefore _scientia cognitionis sensitivae, theoria liberalium artium, gnoseologia inferior, ars pulcre cogitandi, ars analogi rationis_. Rhetoric and Poetic are for him special cases of Aesthetic, which is a general science, embracing both. Its laws are diffused among all the arts, like the mariner's star (_cynosura quaedam_), and they must be always referred to in all cases, for they are universal, not empirical or merely inductive (_falsa regula pejor est quam nulla_). Aesthetic must not be confounded with Psychology, which supplies only suppositions. Aesthetic is an independent science, which gives the rules for knowing sensibly, and is occupied with the perfection of sensible knowledge, which is beauty. Its contrary is ugliness. The beauty of objects and of matter must be excluded from the beauty of sensible knowledge, because beautiful objects can be badly thought and ugly objects beautifully thought. Poetic representations are those which are confused or imaginative. Distinction and intellectuality are not poetic. The greater the determination, the greater the poetry; individuals absolutely determined (_omnimodo determinata_) are very poetical, as are images or fancies, and everything which refers to feeling. The judgment of sensible and imaginative representations is taste.