The Egyptian Book of the dead by P. Le Page Renouf and Edouard Naville

3. The oldest text (which is here the best authority) does not give the

dimensions of the hill, but only of the serpent. The earliest papyri give the dimensions of both, but make the hill so absurdly small that the serpent could not rest upon it. Later papyri beginning with _Pf_ have corrected the texts so as to give the hill a length of 300 cubits, or ⁂ (each of which is 100 cubits long). They omit the statement that the cubit in question is of 7½ palms (the Royal cubit being of 7 palms), and also the interesting mention of the ⁂⁂⁂ “balance (or measurement) of the earth.” The relation of this ‘balance’ to the rest of the sentence is not clear, because the MSS. differ as to the preposition which precedes. The Papyrus of Nebseni gives the hill 300 cubits in breadth. The _Todtenbuch_ of Turin reads 370 ⁂ in length, and 140 cubits in breadth.