Correction.
In the article by Dr. Millikan entitled "The Progress of Physics From 1848 to 1948" (Science, September 3, p. 230) the last part of the fifth paragraph should have read: ". . . Ampere, the Frenchman, in the 1820's had developed that field with great skill and insight; while England's unsurpassed experimentalist, Faraday, had in 1831 discovered electromagnetic induction and in 1834 had laid the secure foundation for the whole field of electrolysis."