351 
of Edinburgh, Session 1867 - 68 . 
accidentally. For this is how I proceeded to take equal account 
of each and every one of the Aiton and Inglis’ sides, while I gave 
their whole, the predetermined weight of two, against the one of 
each of the other three observers. 
Aiton and Inglis, 9120 Jomard, . . = 9163* 
„ 9114 Vyse, . . = 9168* 
,, 9102 Mahmoud Bey, . = 9162- 
,, 9102 Aiton and Inglis, mean of = 9109’5 
Same repeated, . = 9109’5 
Mean to tenths, = 9109‘5. Mean, . . = 9142*4 
or to nearest whole inch, = 9142’ * 
Now here is no strange exclusion of 9120, when 9114 and 9102 
are admitted; and, in fact, such an unwarrantable piece of cooking as 
that would have been, never entered my head, until I read it charged 
upon me by the Proceedings ’ author. It is, in fact, a pure inven- 
tion of his, so far as I know or can see — though I must request the 
Council of the Society, who have printed the erroneous accusation 
to ascertain what its author has to say in his defence. 
Reported additional Authority. 
After venturing the statement at the end of the same paragraph, 
on p. 256 — that the above mean length of 9142 inches, is not 
derived by “ direct measurement, but by indirect logic ’’—-the Pro- 
ceedings' author adds to my “ Life and Work ” data, the following 
particulars from a subsequently printed number of the Athenaeum : — 
“ Lately, Sir Henry James has shown that the length of one of 
“ the sides of the pyramid’s base, with the casing stone added, as 
“ measured by Colonel H. Vyse, — viz. 9168 inches — is precisely 
“ 360 derahs, or land-cubits of Egypt ; the derah being an ancient 
“ land measure still in use, of the length of nearly 25J British 
“ inches, or, more correctly, of 25'488 inches.” 
In this sentence, many persons, recognising the name of the 
* While using this quantity in most calculations, I usually state that it is 
uncertain, from the large difference of its factors, to the extent of =t 25 
inches. With such differences, we need not descend to fractions ; except 
where, as above, the doubling decided on brings the fraction up to a whole 
inch. 
2 z 
VOL. VI. 
