sss 
Mr. B. Babin gton’s Remarks on the Geology 
depth of 27 feet the springs of water begin to gush ; the stratum 1 , 
becomes softer, and more and more mixed with siliceous sand, still 
however of a dark slate-black colour. This continues to 37 feet, 
the lowest point to which the well was dug, when lumps of what 
I suppose to be green martial earth were found intermixed with 
sand. 
In order to give a notion of the level of the peninsula from east 
to west, in the line which I have followed, I subjoin a list of baro- 
metrical -heights. These I took at most stages both going from 
Madras to Callicat and returning ; and I have in such places given 
the result of both observations. The reason they sometimes differ 
so much may be a change in the atmosphere between the observa- 
tions, which I had not the opportunity of correcting by the usual 
means. I merely took an observation at one place, and then at the 
next perhaps 15 miles off, and no allowance is made for difference 
of temperature. Wherever there was a rapid ascent or descent, 
so that not much time elapsed between the observations, as for in- 
stance in mounting the western Ghauts, my barometrical observa- 
tions taken at different times agreed very well. It is remarkable, too, 
that the average heights up to Bangalore, summed up, give the 
same result within a very few feet, as is stated in Arrowsmith’s map 
of India to have been obtained by Major Lambton. They are 
probably therefore pretty correct. 
