His true monument lies not on the shelves of libraries, but in the thoughts of men, and in the history of more than one science.{Gibbs’s obituary for scientist Rudolf Clausius}

I esteem his understanding and subtlety highly, but I consider that they have been put to ill use in the greater part of his work, where the author studies things of little use…{Writing about Isaac...

His Theory of the Universe seems to have been, that it consisted solely of a multitude of objects which could be weighed, numbered, and measured; and the vocation to which he considered himself called was,...

…and his analysis proved him to be the first of theoretical astronomers no less than the greatest of ‘arithmeticians.

As a matter of fact, with all his wit, humor, raillery, persiflage, he was the profoundest logician that ever appealed to the intellect of an American audience. There was logic even in his laughter. He...

The history of the astronomy of the nineteenth century will be incomplete without a catalogue of his labours. He was one of the founders of the Astronomical Society, and his attention to its affairs was...

Except for my daughters, I have not grieved for any death as I have grieved for his. His was a great and beautiful spirit, he was a man – all man, from his crown to...

His work was so great that it cannot be compassed in a few words. His death is one of the greatest losses ever to occur to British science.{Describing Ernest Rutherford upon his death at age...