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According to Mariotte's law, "The temperature remaining constant, the volume varies inversely as the pressure," we should have 15 pounds gauge pressure. The difference, 9 pounds, represents the effect of the heat of compression in increasing the relative volume of the air.

Mariotte had made galettes of buckwheat, the baroness produced a tea-caddy. The illustrious house of du Guenic served a little supper before the departure of its guests, consisting of fresh butter, fruits, and cream, in addition to Mariotte's cakes; for which festal event issued from their wrappings a silver teapot and some beautiful old English china sent to the baroness by her aunts.

The diagrams taken of the engine and compressor show that the work expended in compressing one cubic meter of air to 4.21 effective atmospheres was 38,128 lb. According to Boyle and Mariotte's law it would be 37,534 lb., the difference being 594 lb., or a loss of 1.6 per cent. Or if compressed without abstraction of heat, the work expended would in that case have been 48,158.

The proportion of the water of precipitation taken up by direct evaporation from the surface of the ground seems to have been generally exaggerated, sufficient allowance not being made for moisture carried downwards or in a lateral direction by infiltration or by crevices in the superior rocky or earthy strata. It does not appear whether this inference is Mariotte's or Wittwer's.

Forced to pay ready money, he was nevertheless obliged to sell on time; Gaubertin delivered his timber at long credits for the purpose of ruining his competitor. He undersold him by at least five per cent, and the end of it is that poor Mariotte's credit is badly shaken.

The total mass will follow with fair closeness Mariotte's law, but the characteristic constant will no longer be the same as in the case of a non-dissociated gas. We here no longer have to do with a single molecule, since each molecule is in part dissociated. In dissociation the breaking up is only partial, and the resultant consists of a mixture of decomposed and undecomposed parts.

It is difficult to understand why Gasselin and Mariotte had never married; possibly it might have seemed immoral, they were so like brother and sister. Mariotte's wages were ninety francs a year; Gasselin's, three hundred. But thousands of francs offered to them elsewhere would not have induced either to leave the Guenic household.

I open my old note book; and I see myself once more, on the 6th of August, 1857, in the Bois des Issards, that famous copse near Avignon which I have celebrated in my essay on the Bembex-wasps. "The Hunting Wasps": chapter 14. A fig for Mariotte's flask and Toricelli's tube! His flask is an apparatus contrived to illustrate atmospheric pressure and ensure a constant flow of liquid.