d used in Mexico: evaporation from the surface of the soil, it is manifestly dif- ‘“‘The limestone used was a hard, compact, blue material, ficult to affirm, that all the fluid employed in the watering in some places sufficiently hard to strike fire on the drills has traversed the plant. used in… … mortar to the surface so as to form a layer of to1‘1 per cent. These experiments are very semi-fluid substance on top. simple and easy, and any one interested in the The floor was again allowed to dry, and again beaten over rays. The facts already recorded are plainly discernible. subject can…
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