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"The older view of the nature of heat was that it is a substance, very fine and imponderable indeed, but indestructible, and unchangeable in quantity, which is an essential fundamental property of all matter."
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"Clear skies do not promise rain."

"A puddle repeats infinity, and is full of light; nevertheless, if analyzed objectively, a puddle is a piece of dirty water spread very thin on mud."

"A planet without birds is a planet without angels!"
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"I then endeavoured to show that it is more especially in the thorough conformity with law which natural phenomena and natural products exhibit, and in the comparative ease with which laws can be stated, that this difference exists."

"Not that I wish by any means to deny, that the mental life of individuals and peoples is also in conformity with law, as is the object of philosophical, philological, historical, moral, and social sciences to establish."

"But heat can also be produced by the friction of liquids, in which there could be no question of changes in structure, or of the liberation of latent heat."
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