Physica speculatio[1] is a text of scientific character written by Alonso de la Vera Cruz in 1557 in the capital of New Spain.

It was the first published work in the American continent that specifically addressed the study of physics, and was written to teach the students of the Real University of Mexico.

The Physica speculatio has by object the study or "investigation" -speculatio- and the exhibition, in general, of subjects of physics on the nature -Physica-, treated by fray Alonso de la Vera Cruz basically from the philosophical perspective, characteristic of Aristotle and traditional in the Half Age.

It contains added as appendix the Tractatus de Sphera written by the Italian mathematician and astronomer Campanus of Novara in the 13th century, and printed for the first time in 1518.

The writing is presented according to the scholastic method, proposing first the opinions or negative affirmations, contrary to the thesis that it will sustain, and afterwards the positive, with foundations and explanations.