The names of the plants ought to be stable [certa], consequently they should be given to stable genera.

A professor can never better distinguish himself in his work than by encouraging a clever pupil, for the true discovers are among them, as comets amongst the stars.

Nature does not proceed by leaps.

There is no generation from an egg in the Mineral Kingdom. Hence no vascular circulation of the humours as in the remaining Natural Kingdoms.

The plant kingdom covers the entire earth, offering our senses great pleasure and the delights of summer.

If you do not know the names of things, the knowledge of them is lost, too.

Nature's economy shall be the base for our own, for it is immutable, but ours is secondary. An economist without knowledge of nature is therefore like a physicist without knowledge of mathematics.