During his curriculum he attended the lectures of Professor Jeremiah Day on natural philosophy and Professor Benjamin Sieliman on chemistry, and it was then he imbibed his earliest knowledge of electricity. In 1809-10 Dr. Day was teaching from Enfield's text-book on philosophy, that 'if the (electric) circuit be interrupted, the fluid will become visible, and when: it passes it will leave an impression upon any intermediate body,' and he illustrated this by sending the spark through a metal chain, so that it became visible between the links, and by causing it to perforate paper. Morse afterwards declared this experiment to have been the seed which rooted in his mind and grew into the 'invention of the telegraph.'

It is not evident that Morse had any distinct idea of the electric telegraph in these days; but amidst his lessons in literature and philosophy he took a special interest in the sciences of electricity and chemistry. He became acquainted with the voltaic battery through the lectures of his friend, Professor Sieliman; and we are told that during one of his vacations at Yale he made a series of electrical experiments with Dr. Dwight. Some years later he resumed these studies under his friend Professor James Freeman Dana, of the University of New York, who exhibited the electro-magnet to his class in 1827, and also under Professor Renwick, of Columbia College.