There I engaged fifty-one workmen, and dug a long broad and deep trench in the highest part of the citadel, and sank besides this thirteen shafts 6 feet in diameter.[49] I further sank three shafts in the lower part of the fortress, and four more at a distance of 100 feet outside the walls. In the higher citadel I struck the natural rock at a depth of from 11½ to 16½ feet; in the lower citadel, at from 5 to 8 feet; and outside the citadel I reached the virgin soil at from 3 to 4 feet. In seven or eight of the shafts sunk in the upper citadel I brought to light Cyclopean house-walls built on the natural rock, and in three shafts I found Cyclopean water-conduits of a primitive sort, being composed of unwrought stones, laid without any binding material. Though these water-conduits rest on the rock, yet I cannot conceive how water can ever have run along them without getting lost through the interstices between the stones. Neither in the long trench nor in the deep twelve or thirteen shafts did I find any stones at all. I conclude from this that the majority of the houses consisted of unburnt bricks, which still form the building material of most of the villages in the Argolid. The houses can hardly have been of wood, for, if so, I should have found large quantities of ashes. All my excavations in Tiryns remain of course open, and visitors are invited to inspect them. Among the objects discovered I must first mention the small terra-cotta cows, of which I collected eleven,[50] for they seem to solve a great problem, and are, at all events, of capital importance to science. Nearly all of them are covered with painted ornaments of red colour; one only has a black ornamentation. [Illustration: No. 2. Terra-Cotta Cow, from Tiryns. (1½ M.) Actual size.] [Sidenote: COWS OF TERRA-COTTA.] [Sidenote: IDOLS OF HERA.]