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 The experiments that give us the knowledge of these secrets are multiplied continually; and as they are the sole principles of physics, the consequences are multiplied in proportion.

It is in this manner that we may at the present day adopt different sentiments and new opinions, without despising the ancients and without ingratitude, since the first knowledge which they have given us has served as a stepping-stone to our own, and since in these advantages we are indebted to them for our ascendency over them; because being raised by their aid to a certain degree, the slightest effort causes us to mount still higher, and with less pains and less glory we find ourselves above them. Thence it is that we are enabled to discover things which it was impossible for them to perceive. Our view is more extended, and although they knew as well as we all that they could observe in nature, they did not, nevertheless, know it so well, and we see more than they.

Yet it is marvellous in what manner their sentiments are revered. It is made a crime to contradict them and an act of treason to add to them, as though they had left no more truths to be known.

Is not this to treat unworthily the reason of man and to put it on a level with the instinct of animals, since we take away the principal difference between them, which is that the effects of reason accumulate without ceasing, whilst instinct remains always in the same state? The cells of the bees were as correctly measured a thousand years ago as to-day, and each formed a hexagon as exactly the first time as the last. It is the same with all that the animals produce by this occult impulse. Nature instructs them in proportion as necessity impels them; but this fragile science is lost with the wants which give it birth: as they received it without study, they have not the happiness of preserving it; and every time it is given them it is new to them, since the…nature having for her object nothing but the maintenance of animals in a limited order of perfection, she inspires them with this necessary science…always