In the following pages I have endeavoured to arrange, in something like consecutive order, all that is definitely known concerning the History of the Egyptian Obelisks generally; and more particularly of those now standing. To do this it has been necessary to compare the accounts of many writers, and the measurements of various authors, but the result of such a comparison is far from satisfactory; in truth there is very little agreement between them; and there are several statements which cannot be reconciled with each other. Under these difficulties, I have had to rely chiefly upon the measurements of Bonomi, he being professionally a sculptor as well as an Egyptologist, and, therefore, possessing a double guarantee against liability to errors of detail. With regard to the identifications of the obelisks mentioned by Pliny with those now standing in Rome, it is hardly possible to be quite certain as to any special monument, except perhaps the Obelisk of the Circus Maximus.