42 On the Red Marl Formation of Mysore. 



ing exactly to that in the plain below. On Nundydroog this 

 cap is in many places several feet in thickness, on which is 

 built the old Hindoo fort still remaining. It is common to find 

 arenaceous soil of this kind on the summits of the highest 

 hills, not originating from vegetable decay, or decompositions 

 of the rock, but evidently in its original situation. This 

 would lead to the belief that these hills had at one time 

 been covered to the summit, and had gradually been denu- 

 ded by the detrital action of water and other causes. 



That the soil of this formation is being gradually washed 

 down to the lower plains, no one can doubt, when they 

 observe the sections which the nullahs are rapidly cutting 

 through it, and the constant removal of the disintegrated 

 surface. And as on a general average the red marl is not 

 more than three or four feet in thickness, a period must 

 arrive when this will be all removed, laying bare the granite 

 and the kaolin, which latter totally incapable of supporting 

 vegetation, Mysore will then become a " howling wilder- 

 ness," and as unfitted for the existence of man or beast as 

 the deserts of Africa. 



Sotne remarks on Meteorological Observations. By Captain 

 J. Campbell, Assistant Surveyor General, Madras Esta- 

 blishment. 



After perusing your meteorological observations in the 1st 

 number of the " Calcutta Journal Natural History," I have put 

 together roughly the following remarks as my contribution to 

 assist in the investigation of this subject. 



Being one of those whom you justly censure, who having 

 had considerable opportunities of observing endemic disease, 

 particularly fever, yet from considering the subject to be the 

 province of the physician, thought it best to leave it to 

 him, I therefore add such remarks on the subject as my 



