1861.] attending Combustion in Rarefied Air. 335 



diminution of light by decrease of pressure, but he had not determined 

 the diminution quantitatively nor indicated its cause. 



The speaker stated in conclusion, that he had only yet imperfectly 

 extended his inquiry to pressures higher than that of the atmosphere ; 

 but, so far as these experiments went, they appeared to indicate that 

 the law which had been elicited for lower pressures, also held good for 

 pressures above that of the atmosphere. 



[E. F.] 



EXTRA EVENING MEETING. 



Monday, March 18, 1861. 



Sir Roderick I. Murchison, D.C.L. F.R.S. Vice-President, 

 in the Chair. 



M. F. P. Du Chaillu. 

 Personal Narrative of his Travels in Western Central Africa. 



[No Abstract given.] 



