When therefore the Earl and Raleigh were finally caged together in the Tower for life in 1606 their friendship was of more than twenty years’ standing. From this we infer that Hariot also knew Percy almost from the time of his joining Raleigh; but the earliest mention of his name in connection with that of the Earl which we have met with is this of 1596, in the Earl’s pay-rolls, still preserved at Sion, and described in the Sixth Report of the Royal Commission of Historical Manuscripts, page 227, ‘To Mr. Herytt for a book of the Turk’s pictures, 7s.’ It appears from the same rolls that from Michaelmas 1597 to 1610, if not earlier and later, an annual pension of £80 (not £ 120, or £ 150, £300, as variously stated) was paid to Hariot by the Earl. This pension was probably continued as long as Hariot lived; and besides there are not wanting many marks of the Earl’s liberality, friendship, and love for his companion and pensioner, who was long known as ‘Hariot of Sion on Thames,’ as expressed on his monument. In the Earl’s accounts for 1608 there is this entry, ‘Payment for repairing and finishing Mr Heriotts house at Sion.’ At what time exactly Hariot took up his residence at Sion the Earl’s new seat (purchased of James in 1604) is not known, but probably soon after the Earl was sent to the Tower in 1606. There is preserved a Letter from Sir William Lower addressed to Hariot at Sion dated the 3Oth of September 1607, and other letters or papers exist showing his continued residence there until near the time of his death in 1621. Wood and many subsequent writers to the present time have confused Sion near Isleworth with Sion College in London. They are totally distinct. Hariot had nothing to do with Sion College, which was not founded until 1630, nine years after his death. The error arose out of the coincidence of Torporley’s taking chambers at Sion College on retiring from his clerical profession, and dying there in April 1632, leaving his mathematical books and manuscripts to the College Library. He had been appointed by Hariot to look over, arrange, and ‘pen out the doctrine’ of his mathematical writings. Torporley’s abstracts of Hariot’s papers are still preserved in Sion College Library. What the Earl of Northumberland did for Hariot is, as the world goes, ascribed to patronage ; what Hariot did for the Earl cannot be measured by money or houses, but may be summed up in four words, alike honorable to both, ‘they were long friends.’ To this day the debt of gratitude from the philosopher to the nobleman is fairly balanced by the similar debt of the nobleman to the philosopher. Hariot’s Will, given on pages 193-203, tells the rest of the story of this noble friendship.