338 
Proceedings of the Royal Society 
ceedings author, viz., Alkaisi, died in 1187 a.d., and Abou Szalt, 
of Spain, possibly of about 1400 a.d. 
(Hence the attempt made in the Proceedings note to p. 253, to 
produce out of Yyse’s books an affirmative testimony to the con- 
temporary character of A1 Hokm’s relation touching the Khaliph 
A1 Mamoon’s reported discovery of a body in the coffer, — entirely 
breaks down. And as it is of very little consequence for identifica- 
tion with the original builders of the Great Pyramid and their 
intentions or work, what the Khaliph found in the coffer; — seeing 
that the Pyramid is now considered to have been entered forcibly 
by men of alien faith, some 1500 years after it was built, but more 
than 1400 years before the time of A1 Mamoon, — we might leave 
the matter now at rest, but for an additional statement made by 
the Proceedings 1 author before the Royal Society on April 20. For 
on that occasion he announced having received a letter from the 
British Museum, in effect completely ignoring his former autho- 
rities, Col. Howard Yyse and Dr Sprenger; and affirming that A1 
Hakm lived contemporarily with the Khaliph A1 Mamoon. 
Whether that letter is to be regarded as throwing every other 
authority into the shade, I do not pretend to know ; but the whole 
document should now be printed and submitted to the same public 
opinion which has so long sat approvingly on Col. Howard Yyse’s 
and Dr Sprenger’s opposite and fuller statements).*! 
SIZE OF THE BASE OF THE GREAT PYRAMID. 
After stating in his page 254, in a singularly objectionable man- 
ner, some of my reasons for considering the determination of the 
* Added to the original paper after the meeting. 
| This is the note referred to at foot of page 332, respecting Dr Whitman’s 
numbers for the cubic contents of the coffer in the Great Pyramid. 
Having already shown in the note to pages 331, 332, how the 6000 cubic 
inches, case of difference, from my coffer measures, is explainable by the 
former observer, M. Jomard, having without doubt made an absolute error 
(probably in copying his notes) of 3 whole inches in the depth of the coffer; 
(for these 3 inches being subtracted before the multiplications are performed, 
the alleged difference nearly vanishes) : — I have now to show that the 
other alleged case of a difference, or that under the name of Dr Whitman, 
and to the horrifying extent of 14,000 cubic inches, depends mainly on a 
blunder of still more transparent character. 
Its component numbers are published in Howard Vyse’s second volume. 
