185 
of Forest Marble Clay is 17ft. thick. But at Ampney Crucis 
I find this bed varying from only 4 ft. to 6 ft., and elsewhere it 
becomes still thinner. It is true, on the other hand, that just 
below the gas works there is a thick bed, from 18 ft. to 20 ft., 
of this upper clay. The section has never ‘been described, and 
it is the only one on this line that has escaped record: so that 
its insertion here will not be out of place. 
Section on Mipuanp anp Sovurs-WeEstTERN JuncTION Rartway 
(S.E. of tHE CrreNcEsTER Gas Works). 
ft. in. 
Cornbrash, crowded with characteristic fossils, at S.E. end of 
8 0 
cutting... “en fr nee ino 5c ave aa 
Forest Marble Clay, very dark grey, no fossils found except bits 
of branching Polyzoa or Hydroids, at N.W. end of cutting 18 0 
I could not regard these irregular clays as sufficiently 
accounting for the practically impervious support of so large a 
body of water. Yet I had up to last year no other hypothesis 
to suggest. 
About 1882-3, our fellow member, Mr Taunton, informed 
me that he was boring at Lewis Lane, close to the old brewery- 
well there, and was passing through beds of clay. This was an 
ordinary chisel boring, but I procured a large quantity of the 
triturated material brought up, and with the aid of some of my 
students carefully washed and decanted a good deal of it, and 
submitted it to a thorough examination. We found nothing 
but broken fragments of Ostrea and other shells, and remained 
still in the dark as to what these clays actually were, though 
their presence tended to confirm my suspicions that Buckman’s 
explanation did not satisfy all the conditions of the problem. 
Tae We tt at Lewis Lane (Bowty’s WEt1) 
which I have purposely held over for consideration, was sunk 
some fifteen years ago, (in consequence, I have been told, of 
doubts having been thrown on the purity of a former shallow 
supply,) and was a chisel boring to the depth of 130ft. A con- 
stant supply of water had been obtained from this source; the 
G 
