When all the thoughts are concerning one thing and the person loses interest in other things, the melancholy begins.

There are as many species as the infinite being created diverse forms in the beginning, which, following the laws of generation, produced many others, but always similar to them: therefore there are as many species as we have different structures before us today.

When all the thoughts are concerning one thing and the person loses interest in other things, the melancholy begins.

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

A practical botanist will distinguish at the first glance the plant of the different quarters of the globe and yet will be at a loss to tell by what marks he detects them.

Yet man does recognise himself [as an animal]. But I ask you and the whole world for a generic differentia between man and ape which conforms to the principles of natural history, I certainly know of none... If I were to call man ape or vice versa, I should bring down all the theologians on my head. But perhaps I should still do it according to the rules of science.

If a tree dies, plant another in its place.