" The alternating-current transformer is another gift of Faraday to the commercial world.

Speaking of Faraday in this connection, Professor Tyndall says: "Take him for all in all, I think it will be conceded that Michael Faraday is the greatest experimental philosopher the world has ever seen; and I will add the opinion that the progress of future research will tend not to diminish or decrease, but to enhance and glorify, the labors of this mighty investigator.

There was another series of investigations made by Faraday between the years 1831 and 1840, that has been wonderfully utilized, and may properly be ranked among his great discoveries.

PROFESSOR FARADAY From a photograph by Lewis Carroll, 1860.

Ries, the German electrician, so well known in connection with his invention of the speaking telephone, addressed Faraday as "Professor Michael Faraday, Member of all the Academies."

Morse was appointed electrician of the American company and Faraday of the English company, and much technical correspondence followed between these two eminent scientists.

Such an electric source was given to the world by Faraday through his invention of the dynamo-electric machine, and it was not until this machine was sufficiently developed and improved that commercial electric lighting became possible.

TYNDAL, JOHN, physicist, born in co. Carlow, Ireland; succeeded Faraday at the Royal Institution; wrote on electricity, sound, light, and heat, as well as on the "Structure and Motion of the Glaciers," in opposition to Forbes, whose theory was defended in strong terms by Ruskin; wrote also "Lectures on Science for Unscientific People," much praised by Huxley (1820-1893).