into shorter 'letters', merged, or distributed in small parts into other letters. A section about insect-eating birds in a letter sent to Barrington in 1770 appears in the book as letter 41 to Pennant. Personal remarks have been removed throughout. Thus, while the book is genuinely based on letters to Pennant and Barrington, the structure of the book is a literary device. As a compilation of letters and other materials, the book as a whole has an uneven structure. The first part is a diary-like sequence of 'letters', with the breaks and wanderings that naturally follow. The second is a calendar, organized by phenological event around the year. The third is a collection of observations, organised by animal or plant group and species, with a section on meteorology. The apparently rambling structure of the book is in fact bracketed by opening and closing sections, arranged like the rest as letters, which "give form and scale and even a semblance of narrative structure to what would otherwise have been a shapeless anthology." The unposted Letter 1 begins: "No novelist could have opened better", wrote Virginia Woolf; "Selborne is set solidly in the foreground." Illustrations The first edition was illustrated with paintings by the Swiss artist Samuel Hieronymus Grimm, engraved by W. Angus and aquatinted. Grimm had lived in England since 1768, and was quite a famous artist, costing 2½ guineas per week. In the event, he stayed in Selborne for 28 days, and White recorded that he worked very hard on 24 of them. White also described Grimm's method, which was to sketch the landscape in lead pencil, then to put in the shading, and finally to add a light wash of watercolour. The illustrations were engraved (signed at lower right) by a variety of engravers including William Angus and Peter Mazell. Structure The Natural History of Selborne Letters to Thomas Pennant There are 44 letters to White's friend Thomas Pennant (1726–1798), of which the first nine were never posted and are thus undated. Of those that were posted, the first, Letter 10 giving an overview of Selborne, is dated 4 August 1767; the last, Letter 44 on wood pigeons, is dated 30 November 1780. It is not known how the men became friends, or even if they ever met; White writes repeatedly that he would like to meet "to have a little conversation face to face after we have corresponded