His natural memory was very great, to which he added the art of memory. He would repeat to you forwards and backwards all the signs from Ludgate to Charing Cross." He says of Mr. John Hales, that, "He loved Canarie," and was buried "under an altar monument of black marble--------with a too long epitaph"; of Edmund Halley, that he "at sixteen could make a dial, and then, he said, he thought himself a brave fellow"; of William Holder, who wrote a book upon his curing one Popham who was deaf and dumb, "he was beholding to no author; did only consult with nature." For the most part, an author consults only with all who have written before him upon a subject, and his book is but the advice of so many. But a good book will never have been forestalled, but the topic itself will in one sense be new, and its author, by consulting with nature, will consult not only with those who have gone before, but with those who may come after. There is always room and occasion enough for a true book on any subject; as there is room for more light the brightest day and more rays will not interfere with the first.

We thus worked our way up this river, gradually adjusting our thoughts to novelties, beholding from its placid bosom a new nature and new works of men, and, as it were with increasing confidence, finding nature still habitable, genial, and propitious to us; not following any beaten path, but the windings of the river, as ever the nearest way for us. Fortunately we had no business in this country. The Concord had rarely been a river, or _rivus_, but barely _fluvius_, or between _fluvius_ and _lacus_. This Merrimack was neither _rivus_ nor _fluvius_ nor _lacus_, but rather _amnis_ here, a gently swelling and stately rolling flood approaching the sea. We could even sympathize with its buoyant tide, going to seek its fortune in the ocean, and, anticipating the time when "being received within the plain of its freer water," it should "beat the shores for banks,"--

"campoque recepta Liberioris aquae, pro ripis litora pulsant."

At length we doubled a low shrubby islet, called Rabbit Island, subjected alternately to the sun and to the waves, as desolate as if it lay some leagues within the icy sea, and found ourselves in a narrower part of the river, near the sheds and yards for picking the stone known as the Chelmsford granite, which is quarried in Westford and the neighboring towns. We passed Wicasuck Island, which contains seventy acres or more, on our right, between Chelmsford and Tyngsborough. This was a favorite residence of the Indians. According to the History of Dunstable, "About 1663, the eldest son of Passaconaway [Chief of the Penacooks] was thrown into jail for a debt of (pounds)45, due to John Tinker, by one of his tribe, and which he had promised verbally should be paid. To relieve him from his imprisonment, his brother Wannalancet and others, who owned Wicasuck Island, sold it and paid the debt." It was, however, restored to the Indians by the General Court in 1665. After the departure of the Indians in 1683, it was granted to Jonathan Tyng in payment for his services to the colony, in maintaining a garrison at his house. Tyng's house stood not far from Wicasuck Falls.