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During the war in the Champagne, and amid all the bustle of the camp, he made observations for his theory of color; and as soon as the numberless calamities of that war allowed of his retiring for a short time to the fortress of Luxembourg, he took up the manuscript of his Farbenlehre.

If these observations had been repeated, if they had been found accurate, experience would have been able after some thousands of years to form an art which it would have been difficult to doubt: one would have thought, with some likelihood, that men are like trees and vegetables which must be planted and sown only in certain seasons.

The province of logic must be restricted to that portion of our knowledge which consists of inferences from truths previously known; whether those antecedent data be general propositions, or particular observations and perceptions. Logic is not the science of Belief, but the science of Proof, or Evidence.

Yet it is interspersed with strokes of humor and observations full of good sense. It opens with the airy remark: "The wars in Europe, Asia and Africa, taught me how to subdue the wild savages in Virginia and New England."

When they start downward they have, as observations show, a temperature not much above the freezing point of salt water. They do not congeal for the reason that the salt of the ocean lowers the point at which the water solidifies to near 28° Fahr. The effect of this action is gradually to press down the surface cold water until it attains the very bottom in all the circumpolar regions.

Maryann had a suspicion that the tendency to choke was owing to other causes than crumbs; but as she could not prove her point, and as the baby Richards took it into his head at that moment to burst into an unaccountable and vehement fit of laughter, she merely tossed her head, and resumed her observations.

As she said this, her Henry, who had gone clattering down-stairs a few moments before, presented himself at the door again, and commenced swinging himself, and taking observations of the state of affairs within the chamber. The mother and aunt both concluded within their own minds that it was as well not to take any notice of him, and therefore went on with their conversation.

Upon a raised terrace, to which stone steps lead, stand circular tables, semicircular and quadratic curves, etc. which are covered with signs, writing, and lines. With these instruments, the Brahmins made, and still make, their observations and calculations. We met with several Brahmins busily engaged with calculations and written treatises.

It is a difficult task to make astronomical observations with a sextant in a temperature thirty-eight degrees below zero, or seventy below the freezing-point, as it was this night. It is not pleasant to sit still for any length of time in such weather.

After a few days' rest at my boarding-house, to which I was recommended by a touter, and which was in Canal-street, and was kept by a "cute" Down-easter, or native of the New England States, with whom I engaged for bed and board for eight dollars per week, I sallied forth to make my intended observations, preparatory to leaving for the west. Everything wore a novel aspect.