Gay-Lussac was quick, lively, ingenious and profound, with great activity of mind and great facility of manipulation. I should place him at the head of all the living chemists in France.

I suppose there was never yet a woman who had not somewhere set up on a pedestal in her brain an ideal of manhood. ... He never is finished till the brain of his creator ceases to work, till she has added her last touch to him, and has laid down the burden of life and gone elsewhere, perhaps to some happy land where ideals are more frequently realised than ever happens here.

James Watt was equally distinguished as a natural philosopher and chemist; his inventions demonstrate his profound knowledge of those sciences, and that peculiar characteristic of genius - the union of them for practical application.

Profound minds are the most likely to think lightly of the resources of human reason, and it is the superficial thinker who is generally strongest in every kind of unbelief.

This sentiment of self-contempt is a frequent one in young people of both sexes. Their valuation of themselves varies as much as the barometer, and is as much affected by outward causes.

In the present state of our knowledge, it would be useless to attempt to speculate on the remote cause of the electrical energy... its relation to chemical affinity is, however, sufficiently evident. May it not be identical with it, and an essential property of matter?

Language is not only the vehicle of thought, it is a great and efficient instrument in thinking.