Thirteenth Lecture
Only now are we in a position to explain the periodic waning of the moon in a completely satisfactory manner: for since we find that the moon cures goiter only when it is waning, it follows quite naturally that this very great consumption by goiter sufferers causes the loss of substance in the moon, which is reproduced every month in a manner still unknown to us, which we can explain just as little as why the crab regains its claws.
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