The thickness of a branch is never diminished in the space there is between one leaf and another except by as much as the thickness of the eye that is above the leaf, and this thickness is lacking in the branch up to the next leaf.

Experience is never at fault; it is only your judgment that is in error in promising itself such results from experience as are not caused by our experiments. For having given a beginning, what follows from it must necessarily be a natural development of such a beginning, unless it has been subject to a contrary influence, while, if it is affected by any contrary influence, the result which ought to follow from the aforesaid beginning will be found to partake of this contrary influence in a greater or less degree in proportion as the said influence is more or less powerful than the aforesaid beginning.

All the branches of trees at every stage of their height, united to-gether, are equal to the thickness of their trunk.

The cicatrices of trees grow in thickness more than the sap that flows through them and nourishes them requires.

This ramification of the elm has the largest branch in front, and its smallest are the first and the penultimate when the chief branch is straight.

Consumption is also immediately production, just as in nature the consumption of the elements and chemical substances is the production of the plant.