influenced by ambition. By this means I confer an obligation on those who occupy the same ground with myself; and also on posterity, who, I am aware, will contend with me, as I have done with my predecessors. Natural History Pliny's last work, according to his nephew, was the Naturalis Historia (Natural History), an encyclopedia into which he collected much of the knowledge of his time. Some historians consider this to be the first encyclopedia written. It comprised 37 books. His sources were personal experience, his own prior works (such as the work on Germania), and extracts from other works. These extracts were collected in the following manner: One servant would read aloud, and another would write the extract as dictated by Pliny. He is said to have dictated extracts while taking a bath. In winter, he furnished the copier with gloves and long sleeves so his writing hand would not stiffen with cold (Pliny the Younger in avunculus meus). His extract collection finally reached about 160 volumes, which Larcius Licinius, the Praetorian legate of Hispania Tarraconensis, unsuccessfully offered to purchase for 400,000 sesterces. That would have been in 73/74 (see above). Pliny bequeathed the extracts to his nephew. When composition of Natural History began is unknown. Since he was preoccupied with his other works under Nero and then had to finish the history of his times, he is unlikely to have begun before 70. The procuratorships offered the ideal opportunity for an encyclopedic frame of mind. The date of an overall composition cannot be assigned to any one year. The dates of different parts must be determined, if they can, by philological analysis (the post mortem of the scholars). The closest known event to a single publication date, that is, when the manuscript was probably released to the public for borrowing and copying, and was probably sent to the Flavians, is the date of the Dedication in the first of the 37 books. It is to the imperator Titus. As Titus and Vespasian had the same name, Titus Flavius Vespasianus, earlier writers hypothesized a dedication to Vespasian. Pliny's mention of a brother (Domitian) and joint offices with a father, calling that father "great", points certainly to Titus. Pliny also says that Titus had been consul six times. The first six consulships of Titus were in 70, 72, 74, 75, 76, and 77, all conjointly with Vespasian, and the seventh