(Ignatius Gaston), an ingenious and learned French Jesuit, born at Paris in 1636. He taught polite literature for several years; during which time he composed several small pieces, both in prose and verse, with peculiar delicacy of thought and style. At length he devoted himself entirely to mathematics and natural philosophy, and read all authors, ancient as well as modern, in those branches of knowledge. He died in 1673, of an infectious disorder contracted by confessing and preaching to the prisoners in the Bicetre during the Easter holidays. Father Pardies published several works; of which his Elements of Geometry are well known in this country, where a translation of them has gone through several editions. In 1672 he had a dispute with Sir Isaac Newton respecting his Theory of Light and Colour; which may be seen in the Philosophical Transactions for that year.