15. That which took place from the beginning is daily taking place under our eyes; for the laws of nature are always the same since the constituent elements of organic and inorganic beings are identical.
As we continually see them under the empire of certain circumstances form stones, flowers, and fruits, one can conclude that the bodies of the first living beings were formed as the first stones, — by the reunion of elementary molecules by virtue of the law of affinity, according as the conditions of vitality of the globe have been propitious to this or that species.
The similitude of form and color in the reproduction of individuals of each species can be compared to the similitude of form of each species of crystal. The molecules, being in juxtaposition under the dominion of the same law, produce an analogous whole.