of the Seine, Pont au Change on the other, ran from the Porte Saint-Michel in the University, to the Porte Saint-Denis in the Town. However, under all these names, there were but two streets, parent streets, generating streets, — the two arteries of Paris.

All the other veins of the triple city either derived their supply from them or emptied into them.

Independently of these two principal streets, piercing Paris diametrically in its whole breadth, from side to side, common to the entire capital, the City and the University had also each its own great special street, which ran lengthwise by them, parallel to the Seine, cutting, as it passed, at right angles, the two arterial thoroughfares. Thus, in the Town, one descended in a straight line from the Porte Saint-Antoine to the