The French physicist Louis De Broglie was of the opinion that foreigners in France should attempt to speak French. When the noted British physicist Ralph Howard Fowler visiting Paris to give a lecture to his students at the Sorbonne, de Broglie personally translated the text of his lecture; Fowler then lectured in French using his typewritten notes. After the lecture, de Broglie was approached by a group of his students: "Monsieur le Professeur," they said, "we are greatly puzzled. We expected that Professor Fowler would lecture in English, and we all know enough English to understand. He did not speak English but some other language and we cannot figure out what language it was." "Et parfois!" de Broglie later recalled. "I had to tell them that Professor Fowler was lecturing in French!"