erprise: observatories were
springing up in all directions, and the Astronomer Royal was expected
to advise upon all of the British and Colonial Observatories. It was
necessary also for him to keep in touch with the Continental
Observatories and their work, and this he did very diligently and
successfully, both by correspondence and personal intercourse with the
foreign astronomers. There was also much work on important subjects
more or less connected with his official duties--such as geodetical
survey work, the establishment of time-balls at different places,
longitude determinations, observation of eclipses, and the
determination of the density of the Earth. Lastly, there was a great
deal of time and work given to questions not very immediately
connected with his office, but on which the Government asked his
assistance in the capacity of general scientific adviser: such were
the Correction of the Compass in iron ships, the Railway Gauge
Commission, the Commission for the Restoration of the Standards of
Length and Weight, the Maine Boundary, Lighthouses, the Westminster
Clock, the London University, and many other questions.

Besides those above-mentioned there were a great many subjects which
he took up out of sheer interest in the investigations. For it may
fairly be said that every subject of a distinctly practical nature,
which could be advanced by mathematical knowledge, had an interest for
him: and his incessant industry enabled him to find time for many of
them. Amongst such subjects were Tides and Tidal Observations,
Clockwork, and the Strains in Beams and Bridges. A certain portion of
his time was also given to Lectures, generally on current astronomical
questions, for he held it as his duty to popularize the science as far
as lay in his power. And he attended the meetings of the Royal
Astronomical Society with great regularity, and took a very active
part in the discussions and business of the Society. He also did much
work for the Royal Society, and (up to a certain date) for the British
Association.

All of the foregoing matters are recorded pretty fully in his
Autobiography up to the year 1861. After that date the Autobiography
is given in a much more abbreviated form, and might rather be regarded
as a collection of notes for his Biography. His private history is
given very fully for the first part of his life, but is very lightly
touched upon during his residence at Greenwich. A great part of the
Autob