Although the essential feature of this subject is variety, and though each city of Italy contributed its quota to the sum of culture, attention has now to be directed in a special sense on Florence. Nothing is more obvious to the student who has mastered the first difficulties caused by the intricacy of Italian history, than the fact that all the mental force of the nation was generated in Tuscany, and radiated thence, as from a centre of vital heat and light, over the rest of the peninsula. This is true of the fine arts no less than of Italian poetry, of the revival of learning as well as of the origin of science. From the republics of Tuscany, and from Florence in particular, proceeded the impulse and the energy which led to fruitful results in all of these departments. In proportion as Florence continued to absorb the neighbouring free States into herself, her intellectual pre-eminence became the more unquestionable. Arezzo, Volterra, Cortona, Montepulciano, Prato, and Pistoja were but rivulets feeding the stream of Florentine industry. What caused this superiority of the Tuscans is a problem as difficult to solve as the similar problem with respect to Athens among the states of Greece. Something may no doubt be attributed to ethnology, and something to climate. Much, again, was due to the purity of a dialect which retained more of native energy and literary capacity, and which had suffered less from barbarian admixtures than the dialects of northern or of southern Italy. The conquest of the Lombards passed the Tuscans by, nor did feudal institutions take the same root in the valley of the Arno which they struck in the kingdom of Naples. The cities of Tuscany were therefore less exposed to foreign influences than the rest of Italy. While they pursued their course of internal growth in comparative tranquillity, they were better fitted for reviving the past glories of Latin civilisation upon its native soil. The free institutions of the Florentine commonwealth must also be taken into account.