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.

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

No one has been a greater botanist or zoologist. No one has written more books, more correctly, more methodically, from personal experience. No one has more completely changed a whole science and started a new epoch.

Botany is based on fixed genera.

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

This drink has a magical power. It strengthens the weak, and revives those who have fainted. Those tired after work and physical activity can return their life forces by this drink much sooner than by nourishment. ... It works as a diuretic, an appetizer, an antitoxin.

To live by medicine is to live horribly.