To you, Sir, that have visited the boasted remains of Italy, and other transmarine parts, it would seem presumptuous to offer the trifle of the following letter, were I not sufficiently apprized of your great humanity and candour, which prompts you to encourage even the blossoms of commendable studies. You, that have made an intimate search, and happily obtained a thorough insight into Nature, consider that she proceeds regularly by successive gradations from little things to greater. The acquisition of any part of science is owing to a conversation with its elements and first principles, whose very simplicity renders them not disagreeable. These pages were memoradums I took in a summer’s journey with our friend Mr. Roger Gale. This being my first expedition since I came to live at London, I design as early as possible to commemorate the felicity I enjoyed thereby of your acquaintance, and the opportunity of observing the noble character you sustain, of possessing all the wisdom that ancient or modern learning can give us without vanity, and that the physician, the scholar, and the gentleman, meet in you. [Sidenote: +Bibroci.+] I observe, in Berkshire, a river called Ock, running in the north side of the county by Abingdon into the Thames, which in the Celtic language signifies sharp or swift, or perhaps water in general: this is in Oke hundred. In the south side of the county is the town of Okeingham. These seem plainly remnants of the old name of the inhabitants of this country, _Bibroci_, not yet observed. Near Reading is Laurence-Waltham, which has been Roman: there is a field called Castle-field, and vast numbers of coins found. By it is Sunning, once an episcopal see. From London to Maidenhead it is a gravelly soil; then a marly chalk begins. [Sidenote: +Reading.+] [Sidenote: TAB. XXVI.] [Sidenote: TAB. XXIII.]