the
study of the fathers._

His father being somewhat uneasy to observe so much time spent by him
on rabbinical trifles, thought it necessary now to recall him to the
study of the Greek language, which he had of late neglected, but to
which he returned with so much ardour, that, in a short time, he was
able to read Greek with the same facility as French or Latin.

He then engaged in the perusal of the Greek fathers, and councils of
the first three or four centuries; and undertook, at his father's
desire, to confute a treatise of Samuel Crellius, in which, under the
name of Artemonius, he has endeavoured to substitute, in the beginning
of St. John's gospel, a reading different from that which is at
present received, and less favourable to the orthodox doctrine of the
divinity of our Saviour.

This task was undertaken by Barretier with great ardour, and
prosecuted by him with suitable application, for he not only drew up a
formal confutation of Artemonius, but made large collections from the
earliest writers, relating to the history of heresies, which he
proposed at first to have published as preliminaries to his book, but,
finding the introduction grew at last to a greater bulk than the book
itself, he determined to publish it apart.

While he was engrossed by these inquiries, accident threw a pair of
globes into his hands, in October, 1734, by which his curiosity was so
much exalted, that he laid aside his Artemonius, and applied himself
to geography and astronomy. In ten days he was able to solve all the
problems in the doctrine of the globes, and had attained ideas so
clear and strong of all the systems, as well ancient as modern, that
he began to think of making new discoveries; and for that purpose,
laying aside, for a time, all searches into antiquity, he employed his
utmost interest to procure books of astronomy and of mathematicks, and
made such a progress in three or four months, that he seemed to have
spent his whole life upon that study; for he not only made an
astrolabe, and drew up astronomical tables, but invented new methods
of calculation, or such at least as appeared new to him, because they
were not mentioned in the books which he had then an opportunity of
reading; and it is a sufficient proof, both of the rapidity of his
progress, and the extent of his views, that in three months after his
first sight of a pair of globes, he formed schemes for finding the
longitude, which he sent, in January, 17