The Temple of Pandrosus was on a lower level, and was approached by a flight of steps, corresponding with which was a chamber, containing the well of salt water, and which apparently was the abode of the serpent-god Erechthonios, mentioned by Herodotus.[147] The central cell was lighted by the very exceptional expedient of 3 windows in the western wall, which looked directly into it. Beyond this, on the south, was the beautiful caryatide porch, where, if anywhere within the temple, grew the olive sacred to Minerva. Unfortunately, our principal guide, Pausanias, does not give us a hint where the olive-tree grew, and on the whole I am inclined to believe it was in the enclosure outside the western wall of the temple,[148] and to which a doorway leads directly from the Temple of Pandrosus, as well as one under the north portico, the use of which it is impossible to explain unless we assume that this enclosure was really of exceptional importance. TEMPLE OF DIANA AT EPHESUS. A history of Grecian architecture can hardly be considered as complete without some mention of the great Ephesian temple, which was one of the largest and most gorgeous of all those erected by the Greeks, and considered by them as one of the seven wonders of the world. Strange to say, till very recently even its situation was utterly unknown; and even now that it has been revealed to us by the energy and intelligence of Mr. Wood, scarcely enough remains to enable him to restore the plan with anything like certainty. This is the more remarkable, as it was found buried under 17 to 20 feet of mud, which must have been the accumulation of centuries, and might, one would have thought, have preserved considerable portions of it from the hand of the spoiler. [Illustration: 159. Plan of the Temple of Diana at Ephesus, embodying Mr. T. Wood’s discoveries. Scale 100 ft. to 1 in.] The annexed plan compiled from Mr. Wood’s researches embodies all the information he has been able to obtain. The dimensions of the double peristyle, and the number and position of its 96 columns, are quite certain. So are the positions of the north, south, and west walls of the cella; so that the only points of uncertainty are the positions of the four columns necessary to make up the 100 mentioned by Pliny,[149] and the internal arrangement of the cella itself and of the opisthodomus. With regard to the first there seems very little latitude for choice. Two must have stood between the antæ. The position of the other two must be determined either by bringing forward the wall enclosing the stairs, so as to admit of the intercolumniation east and west being the same as that of the other columns, or of spacing them so as to divide the inner roof of the pronaos into equal squares. I have preferred the latter as that which appears to me the most probable.[150]