[PLATE: NEBULA IN SOUTHERN HEMISPHERE, drawn by Sir John Herschel.]
But this work must follow the observations, it could not precede
them. The first step was therefore to observe and to measure with
the utmost care the positions and distances of those particular
double stars which appear to offer the greatest promise in this
particular research. In 1821, Herschel and a friend of his, Mr.
James South, agreed to work together with this object. South was a
medical man with an ardent devotion to science, and possessed of
considerable wealth. He procured the best astronomical instruments
that money could obtain, and became a most enthusiastic astronomer
and a practical observer of tremendous energy.
South and John Herschel worked together for two years in the
observation and measurement of the double stars discovered by Sir
William Herschel. In the course of this time their assiduity was
rewarded by the accumulation of so great a mass of careful
measurements that when published, they formed quite a volume in the
"Philosophical Transactions." The value and accuracy of the work,
when estimated by standards which form proper criteria for that
period, is universally recognised. It greatly promoted the progress
of sidereal astronomy, and the authors were in consequence awarded
medals from the Royal Society, and the Royal Astronomical Society,
as well as similar testimonials from various foreign institutions.
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