The article examines the Elements of Philosophy, taught by Andres Bello to Juan Alemparte in Santiago de Chile around 1840-1843 and currently preserved in a manuscript copy. It is shown that the Elements of Philosophy correspond to a preliminary outline of the matters addressed by Bello both in the newspaper El Crepusculo and in his posthumous work Philosophy of the Understanding. For this reason, it is proposed that these manuscript notes constitute an exclusive testimony of the private lessons of the Venezuelan Master in Santiago of the 19th century and exhibit a stage of early maturation of ideas that will become gravitational in his magnum opus. It is expected that this material represents an input for future research on perceptions in general, and from the perspective of the thinker from Caracas in particular.