Fig. l. Theoretical section, illustrating the Hydraulic conditions of strata disposed in the form of Basins, See Vol. l. p. 565, Note. (Original.)

Fig. 2. Theoretical section, shewing the effect of Faults and Dykes on water percolating inclined and permeable Strata. See Vol. l. p. 566, Note. (Original.)

Fig. 3. Double Artesian Fountain at St. Ouen, near Paris, raising water to supply a Canal basin, from two strata at different depths. The water from the lowest stratum rises to the greatest height. See V. I. p. 562. Note. (Hericart de Thury.)