In natural science the principles of truth ought to be confirmed by observation.

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

To live by medicine is to live horribly.

It is the genus that gives the characters, and not the characters that make the genus.

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

I demand of you, and of the whole world, that you show me a generic character... by which to distinguish between Man and Ape. I myself most assuredly know of none.

Blessed be the Lord for the beauty of summer and spring, for the air, the water, the verdure, and the song of birds.