20 
in the sands and basement beds of the Inferior Oolite, which 
rest on the impervious clays of the Upper Lias. The Chelt was 
referred to in respect of the variation in its maximum and 
minimum flow. The stream above Cheltenham was found from 
numerous gaugings made by the author to have a variation 
between one and 39; the large range being evidently due to 
its traversing with its tributaries so much of the impervious 
clays of the Upper Lias. The next subject was the temperature 
of springs as influenced by the permeable strata through which 
they pass above their efflux level. Experiments made at 
Cirencester as to the relative temperature of the water issuing 
at the bottom of the waterworks at the Company’s well in 
Lewis Lane, and in the wells of the gravel-bed 100 feet above, 
were cited with others at Chalford to show the relative tem- 
perature of the springs thrown out by the Fuller’s Earth and 
by the Upper Lias, and this in connection with Jounz’s well 
established law, which has determined a ‘thermal unit,” 
based on his discovery that “the transformation of heat into 
mechanical energy, or of mechanical energy into heat, always 
takes place in a definite mechanical ratio.” 
This was the last meeting of the Club for the season 
and I think that the record may fairly confirm the claim I 
put forward in my initiatory statement, that our published 
Transactions for the period show no falling off in the papers 
contributed by members of the Cotteswold Naturalists’ Field 
Club. 
