visible to the peculiar delicacy of the photographic telescope.

In his earlier years, Lord Rosse himself used to be a diligent
observer of the heavenly bodies with the great telescope which was
completed in the year 1845. But I think that those who knew Lord
Rosse well, will agree that it was more the mechanical processes
incidental to the making of the telescope which engaged his interest
than the actual observations with the telescope when it was
completed. Indeed one who was well acquainted with him believed Lord
Rosse's special interest in the great telescope ceased when the last
nail had been driven into it. But the telescope was never allowed to
lie idle, for Lord Rosse always had associated with him some ardent
young astronomer, whose delight it was to employ to the uttermost the
advantages of his position in exploring the wonders of the sky. Among
those who were in this capacity in the early days of the great
telescope, I may mention my esteemed friend Dr. Johnston Stoney.

Such was the renown of Lord Rosse himself, brought about by his
consummate mechanical genius and his astronomical discoveries, and
such the interest which gathered around the marvellous workshops at
Birr castle, wherein his monumental exhibitions of optical skill were
constructed, that visitors thronged to see him from all parts of the
world. His home at Parsonstown became one of the most remarkable
scientific centres in Great Britain; thither assembled from time to
time all the leading men of science in the country, as well as many
illustrious foreigners. For many years Lord Rosse filled with marked
distinction the exalted position of President of the Royal Society,
and his advice and experience in practical mechanical matters were
always at the disposal of those who sought his assistance. Personally
and socially Lord Rosse endeared himself to all with whom he came in