In 1771 a proposal was made to Priestley to accompany Captain Cook in
his second voyage to the South Seas. He accepted it, and his
congregation agreed to pay an assistant to supply his place during his
absence. But the appointment lay in the hands of the Board of
Longitude, of which certain clergymen were members; and whether these
worthy ecclesiastics feared that Priestley's presence among the ship's
company might expose His Majesty's sloop _Resolution_ to the fate
which aforetime befell a certain ship that went from Joppa to Tarshish;
or whether they were alarmed lest a Socinian should undermine that
piety which, in the days of Commodore Trunnion, so strikingly
characterised sailors, does not appear; but, at any rate, they objected
to Priestley "on account of his religious principles," and appointed
the two Forsters, whose "religious principles," if they had been known
to these well-meaning but not far-sighted persons, would probably have
surprised them.

In 1772 another proposal was made to Priestley. Lord Shelburne,
desiring a "literary companion," had been brought into communication
with Priestley by the good offices of a friend of both, Dr. Price; and
offered him the nominal post of librarian, with a good house and
appointments, and an annuity in case of the termination of the
engagement. Priestley accepted the offer, and remained with Lord
Shelburne for seven years, sometimes residing at Calne, sometimes
travelling abroad with the Earl.

Why the connection terminated has never been exactly known; but it is
certain that Lord Shelburne behaved with the utmost consideration and
kindness towards Priestley; that he fulfilled his engagements to the
letter; and that, at a later period, he expressed a desire that
Priestley should return to his old footing in his house. Probably