1861.] Professor Tyndall on Solar Chemistry. 387 



trave, and pyramid, leaving 65 unaccounted for. This was a puzzle 

 which the theoretical restorers had failed hitherto to resolve ; but a 

 comparison with the tombs still existing in the adjoining country, in 

 Caria itself, at Mylasa in Lycia, and at Souma in Algeria, shows 

 that it was not unusual to erect such monuments on very lofty base- 

 ments. He added, that the scattered composition of the frieze and 

 the elongated proportions of the figures on it were adapted to be seen 

 at a great height above the eye, as would be the case in the proposed 

 restoration. 



Mr. Newton concluded his discourse by stating that he had, he 

 believed, discovered the very stone which had closed the entrance to 

 the original sepulchre of the king, — a huge block of marble, weighing 

 ten tons, carefully grooved at the edges and then lowered by ma- 

 chinery into sockets, like a portcullis. Close to it was also a staircase, 

 which he believed was made to enable the body of Mausolus to be 

 lowered into its resting-place. The numerous statues of lions which 

 had been met with, must have been placed round the tomb to guard 

 it. Lastly, Mr. Newton added, that the whole of the sculptures had 

 once been painted, the flesh generally a dun colour, with an ultra- 

 marine background. 



[C. T. N.] 



WEEKLY EVENING MEETING, 



Friday, June 7, 1861. 



The Duke of Northumberland, K.G. F.R.S. President, 

 in the Chair. 



John Tyndall, Esq. F.R.S. 



PBOFE380B OF- NATUBAL PHILOSOrHY, BOTAL IKSTITUTIOK. 



On the Physical Basis of Solar Chemistry. 



Omitting all preface, the speaker drew attention to an experimental 

 arrangement intended to prove that gaseous bodies radiate heat in 

 different degrees. Behind a double screen of polished tin was placed 

 an ordinary ring gas-burner ; on this was placed a hot copper ball, 

 from which a column of heated air ascended : behind the screen, butl^ 

 so placed that no ray from the ball could reach the instrument, was 

 an excellent thermo-electric pile, connected by wires with a very 

 delicate galvanometer. The thermo-electric pile was known to be an 

 instrument whereby heat was applied to the generation of electric 



2ji2 



