Geological Society. 239 



I may state therefore, in conclusion, that the average electromotive 

 force per cell of the Daniell's batteries which I have used, produces a 

 difference of potentials amounting to '0021 in British electrostatic 

 measure. This statement is perfectly equivalent to the following in 

 more familiar terms : — 



One thousand cells of Daniell's battery, with its two poles connected 

 by wires with two parallel plates of metal y^jth of a foot apart and 

 each a square foot in area, produces an electrical attraction equal to 

 the weight of 55 grains. 



GEOLOGICAL SOCIETY. 



[Continued from p. 166.] 



May 16, 1860. — L. Horner, Esq., President, in the Chair. 



The following communication was read : — 



" On the co-existence of Man with certain Extinct Quadru- 

 peds, proved by Fossil Bones, from various Pleistocene Deposits, 

 bearing Incisions made by sharp instruments." By M. E. Lartet, 

 For.M.G.S. In a Letter to the President. 



The author, having for some time past made observations upon fossil 

 bones exhibiting evident impressions of human agency, was requested 

 by the President, who had examined the specimens indicated, to 

 communicate the results of his researches to this Society. 



The specimens referred to are : — 1st, fragments of bones oi Aurochs 

 exhibiting very deep incisions, made apparently by an instrument 

 having a waved edge ; 2ndly, a portion of a skull of Megaceros hiber- 

 nicus, bearing significant marks of the mutilation and flaying of a re- 

 cently slain animal. These w r ere obtained from the lowest layer in 

 the cutting of the Canal de l'Ourcq, near Paris, and have been figured 

 by Cuvier in his ' Ossem. Foss.' Molars of Elephas yrimigenius 

 found in the same deposit are figured by Cuvier, who states that 

 they had not been rolled, but had been deposited in an original and 

 not a remanie deposit. 3rdly. Among bones, with incisions, from the 

 sands of Abbeville, are a large antler of an extinct stag (Cervus So- 

 menensis) and several horns of the common Red-Deer. 4thly. Bones 

 of Rhinoceros tichorhinus from Menchecourt, near Abbeville, where 

 flints worked by human hands have been found. 4thly. Portions of 

 horns of Megaceros from the British Isles. In reference to the re- 

 mains of the Gigantic Deer, M. Lartet alludes to the Rev. J. G. 

 Cumming's statement that »tone implements have been found in 

 the Isle of Man imbedded with remains of the Megaceros, and that 

 hatchet- marks have been seen on an oak-tree in a submerged forest 

 of possibly still older date. 5thly. Fragments of bone collected by M. 

 Delesse from a deposit near Paris, and exhibiting evidence of having 

 been sawn, not with a smooth metallic saw, but with such an in- 

 strument as the flint knives or splinters, with a sharp chisel- edge, 

 found at Abbeville would supply. 



If, says the author, the presence of worked flints in the gravel 

 and sands of the valley of the Somme have established with certainty 

 the existence of man at the time when those very ancient deposits 



