earliest of these were mathematics and astronomy, in the pursuit of
which he met Flamsteed and Halley. His gift for the detection and
practical employment of general laws soon carried him much farther
afield in the sciences. Metallurgy, geology, a varied field of
invention, chemistry, as well as his duties as an Assessor on the
Board of Mines and of a legislator in the Diet, all engaged him, with
an immediate outcome in his work, and often with results in
contributions to human knowledge which are gaining recognition only
now. The _Principia_ and two companion volumes, dedicated to his
patron, the Duke of Brunswick, crowned his versatile productions in
the physical sciences. Academies of science, at home and abroad, were
electing him to membership.

Conspicuous in Swedenborg's thought all along was the premise that
there is a God and the presupposition of that whole element in life
which we call the spiritual. As he pushed his studies into the fields
of physiology and psychology, this premised realm of the spirit became
the express goal of his researches. Some of his most valuable and most
startling discoveries came in these fields. Outstanding are a work on
_The Brain_ and two on the _Animal Kingdom_ (kingdom of the _anima_,
or soul). As his gaze sought the soul, however, in the light in which
he had more and more successfully beheld all his subjects for
fifty-five years, she eluded direct knowledge. He was increasingly
baffled, until a new light broke in on him. Then he was borne along,
in a profound humiliation of his intellectual ambitions, by another
way. For when the new light steadied, he had undergone a personal
religious experience, the rich journals of which he himself never
published. But what was of public concern, his consciousness was
opened into the world of the spirit, so that he could observe its
facts and laws as, for so long, he had observed those of the material