1863.] 529 



superjacent strata, which are most regularly superposed (as seen in 

 the accompanying section) to a depth of more than 15 feet. This 

 complete regularity of superposition in the strata of the gravel-pits 

 of Moulin- Quignon has, I understand, been already verified by nu- 

 merous experienced geologists, whose testimony upon such a point 

 is of far higher value than mine ; but it is so obvious that I cannot 

 imagine the least doubt to remain in the mind of any intelligent 

 observer who may visit the locality and examine its condition for 

 himself, of the jaw having been imbedded in the lowest stratum 

 before the deposition of the superincumbent layers. 



I have further to point out, that as the gravel-bed of Moulin- 

 Quignon is about 100 feet above the present level of the river, it 

 corresponds in position with the upper gravel of St. Acheul, not 

 with the lower gravel of Menchecourt. If, therefore, we accept the 

 conclusions of Mr. Prestwich as to the relative ages of these gravels, 

 this human jaw was buried in the very oldest portion of the earliest 

 of these fluviatile deposits, and therefore dates back to the very 

 remotest period at which we have at present any evidence of the 

 existence of Man. 



Believe me, dear Mr. President, 



Yours faithfully, 



WILLIAM B. CARPENTER. 



April 23, 1863. 

 Major-General SABINE, President, in the Chair. 



The Right Hon. Sir Edmund Walker Head was admitted into the 

 Society. 



The following communications were read : 



I. "On the Diurnal Inequalities of Terrestrial Magnetism, as 



deduced from observations made at the Royal Observatory, 



Greenwich, from 1841 to 1857." By GEORGE BIDDELL 



AIRY, F.R.S., Astronomer Royal. Received April 8, 1863. 



(Abstract.) 



The author describes this paper as one of the class which gives 

 the epitomized results of long series of voluminous observations and 

 laborious calculations, of which the fundamental details have been 



