"He does not seem to catch at the name of Newton," said Waife, trying it thrice again, and vainly, "and yet he seems extremely well versed in the principle of gravity. Sir Isaac!" The dog bounded towards him, put his paws on his shoulder, and licked his face. "Just cut out those figures carefully, my dear, and see if we can get him to tell us how much twice ten are--I mean by addressing him as Sir Isaac." Sophy cut the figures from the multiplication table, and arranged them, at Waife's instruction, in a circle on the floor. "Now, Sir Isaac." Mop lifted a paw, and walked deliberately round the letters. "Now, Sir Isaac, how much are ten times two?" Mop deliberately made his survey and calculation, and, pausing at twenty, stooped, and took the letters in his mouth. "It is not natural," cried Sophy, much alarmed. "It must be wicked, and I'd rather have nothing to do with it, please." "Silly child! He was but obeying my sign. He had been taught that trick already under the name of Mop. The only strange thing is, that he should do it also under the name of Sir Isaac, and much more cheerfully too. However, whether he has been the great Newton or not, a live dog is better than a dead lion. But it is clear that, in acknowledging the name of Sir Isaac, he does not encourage us to take that of Newton; and he is right: for it might be thought unbecoming to apply to an animal, however extraordinary, who by the severity of fortune is compelled to exhibit his talents for a small pecuniary reward, the family name of so great a philosopher. Sir Isaac, after all, is a vague appellation; any dog has a right to be Sir Isaac--Newton may be left conjectural. Let us see if we can add to our arithmetical information. Look at me, Sir Isaac." Sir Isaac looked and grinned affectionately; and under that title learned a new combination with a facility that might have relieved Sophy's mind of all superstitious belief that the philosopher was resuscitated in the dog, had she known that in life that great master of calculations the most abstruse could not accurately cast up a simple sum in addition. Nothing brought him to the end of his majestic tether like dot and carry one. Notable type of our human incompleteness, where men might deem our studies had made us most complete! Notable type, too, of that grandest order of all human genius which seems to arrive at results by intuition, which a child might pose by a row of figures on a slate, while it is solving the laws that link the stars to infinity! But /revenons a nos moutons/, what was the astral attraction that incontestably bound the reminiscences of Mop to the cognominal distinction of Sir Isaac? I had prepared a very erudite and subtle treatise upon this query, enlivened by quotations from the ancient Mystics,--such as Iamblicus and Proclus,--as well as by a copious reference to the doctrine of the more modern Spiritualists, from Sir Kenelm Digby and Swedenborg, to Monsieur Cahagnet