Even insects express anger, terror, jealousy, and love by their…

The subject may appear an insignificant one, but we shall see that it possesses some interest; and the maxim "de minimis lex non curat," does not apply to science.

[T]he young and the old of widely different races, both with man and animals, express the same state of mind by the same movements.

… cell of a tentacle, showing the various forms successively assumed by the aggregated masses of protoplasm.

The Beagle staid at St. Helena five days, during which time I lived in the clouds in the centre of the Isd.—It is a curious little world within itself; the habitable part is surrounded by a broad band of black desolate rocks, as if the …

Through the principle of associated habit, the same movements of the face and eyes are practised, and can, indeed, hardly be avoided, whenever we know or believe that others are blaming, or too strongly praising, our moral conduct.

As I was led to keep in my study during many months worms in pots filled with earth, I became interested in them, and wished to learn how far they acted consciously, and how much mental power they displayed.