The division of the edifice exclusively noticed by Mr. Horneman, may give some further indication of its use and purpose, and perhaps may be found to strengthen the conjecture, “that these are the very ruins of the once famous oracular temple consecrated by the _Egyptian_ Danaus, to the divinity of Ammon.” The writer of this note will on no account, and in no degree, discuss the position of country, within which the renowned temple of Ammon was erected. He considers that question as concluded, and for ever set at rest, in the acute and learned comment on the Geography of Herodotus, by Mr. Rennell. The facts, the arguments, and the inferences stated in that admirable work, indisputably shew the Oasis of Siwah, to have been the Oasis of Ammon. The precincts are thus narrowed, within which our researches are to be directed, for ascertaining the locality, and even the very remains of the temple itself: and this concurrent circumstance will be held in mind, whilst certain details in the description given us of the ruins discovered at Siwah, are examined and brought to the test, by reference to such few particulars as are recorded by ancient writers concerning the temple of Ammon. The general description of the materials, of the architecture, and of the sculptures, may render it unnecessary to prolong this essay, by discussing the question of _when_, and _by whom_ was the building erected? Those who may yet entertain a doubt, that it was a most ancient Egyptian edifice, are referred to the writings of Norden, of Pocock, of Lucas, and above all, to the treatise of Major Rennell above cited. The annotator ventures to assume the fact; and merely add, τὸ μὲν τέμενος φασὶν ἰδρύσασθαι Δαναὸν τον Αιγύπτιον. Diod. Sic. Tom. II. Ed. Wesseling. page 198. So much as to the building and its antiquity being taken for granted; the following comment will advert to circumstances exclusively noticed by Mr. Horneman, and which may lead to further inferences, as to its original purpose and designation. First, In ascertaining the supposed remains of an oracular temple, vestiges of the _adytum_, would be an object of particular research: and perhaps such may be discovered in that part of Mr. Horneman’s description, where he mentions _the different levels of the basement or floor of the ancient edifice at Siwah_. Hen. Steph. in Thesaur. art. “Adytum,” ἄδυτον, locus secretior templi, ad quem non nisi sacerdotibus dabatur accessus, nam ex eo oracula reddebantur. The _adytum_, was not only a recess, rendered secret by the reverential awe which forbad approach of the vulgar; but was actually a kind of _crypt_, or place of concealment: among the prodigies forerunning the victories of Cæsar in Asia, “Pergami in _occultis_ ac remotis templi, quæ Græci ἄδυτα appellant, tympana sonuêre. Bell. Civil. lib. iii. cap. 105.