^{page 520 note 1} Mr. Prestwich remarks, that “a few trials for coal would not be very costly, and could hardly fail in important results, as in case of failing at once to hit the Coalmeasures we might possibly find the Lower Greensands, and thus solve one or other of the great questions,—of discovering the productive Coal-strata of the Somerset and Belgian band, or of obtaining the pure and abundant waters of the Lower Greensands, both considerations of high importance for this great metropolis.” (p. 165.)