So great was the fame, and such the charm of the building that when the great sculptor Canova[134] visited England, and was asked should he ever wish to return to the country? he answered, 'Yes, that I might again see S. Paul's Cathedral, Somerset House, and S. Stephen's, Walbrook.' [_SIR ISAAC NEWTON._] In the midst of so much work it is not wonderful that, for the moment, Wren's diligent attendance at the Royal Society slackened somewhat, though at the end of 1672 his name occurs among those of the Society who cordially welcomed Isaac Newton to their fellowship. Wren bestowed especial praise on Newton's invention of a refracting telescope. Friends they appear always to have remained, and their dispositions were not unlike, though the travels and varied experiences of Wren's early years had quickened his faculties, and prevented that entire absorption in one idea which is evident from many stories about Isaac Newton. As, for instance, when one of Newton's philosophical friends abroad-- 'Sent him a curious prism, at that time a rarity in England, it was taken to the Custom House and Newton claimed it. The officers asked him to set some value upon it that they might regulate the duty. Newton, rating the prism by his own idea of its use and excellence, replied, "The value is so great I cannot ascertain it." They pressed him again to set some estimate on it, but he still replied, "I cannot say what it is worth, for the value is inestimable." The honest Custom House officers took him at his word, and made him pay an exorbitant duty for the prism, which he might have taken away upon only paying a rate according to the weight of the glass!'[135] The Royal Society was at this time put to serious inconvenience, as more than half of the members failed in paying their weekly money. Wren, who, as might be expected, was one of those who paid most punctually, was re-elected a member of the council, and agreed to serve on a committee for this special matter. The death of his friend and cousin, Matthew, in the summer of 1672, was a grief to him, as well as a loss to the Royal Society, of which he had been a member from its beginning. On the 20th of November, 1673, Wren received the well-earned honour of knighthood from King Charles at Whitehall. No details of any kind respecting the ceremony are to be found in the chary family record.