The excavators naturally sought for the conduit of Peisistratos in the immediate neighbourhood of Kallirrhoë, and there, close up to the Pnyx rock, they found it, at a distance of about 40 metres from the rock chamber Y. From that point up to the South of the Odeion of Herodes Atticus its course has been completely excavated. It is best seen in Professor Dörpfeld’s official plan (Fig. 46). Just South of the Odeion the conduit could not be cleared out, because of its damaged condition and the mass of _débris_ that had fallen over it. Between the Odeion and the Dionysiac theatre it runs beneath an ancient road, and passes within the precinct of Dionysos, between the earlier and later temples. Beyond that point its course has not been excavated in detail, but beneath the modern Russian church a conduit passes which must be its continuation, and this leads on to the water-course[269] discovered long ago, now utilized for watering the Royal Gardens. This water is known to come from the upper valley of the Ilissus (Fig. 49). The main conduit ran, then, from the upper valley of the Ilissus to the great reservoir basin marked on the plan in Fig. 35, but from this main conduit several branches can be traced; the most important are the branch tunnel that leads to the district of Koile and a smaller branch that goes off to water the Amyneion. Other ramifications can be traced, the object of which is not always clear; they probably occur at points where in piercing the tunnel veins of water were reached, and some served to bring to the main conduit subsidiary supplies from the Hill of the Muses and from the Acropolis. Only those, as Professor Dörpfeld[270] himself remarks, who have taken the trouble to get right down into the tunnellings and cross tunnellings and explore them thoroughly so far as they can be explored, can form any idea of the magnitude of the work. Sometimes it is possible to stand upright in the conduit, some portions can only be reached on the hands and knees. The fact is borne in upon any one and every one who has made even a brief exploration, he feels himself unquestionably exploring what must have been the main artificial water-supply of ancient Athens, and here, if such a supply were needed, must have been the centre of the ancient city life.