Alexander Bergs, Social networks and historical sociolinguistics: Studies in morphosyntactic variation in the Paston letters (1421–1503). Berlin: Mouton de Gruyter, 2005. Pp. xii, 318. Hb $123.20. Dedicated to morphosyntactic variation in the late Middle English Paston letters, this book comprises seven chapters, notes, and author and subject indexes. The introductory chapter gives a clear picture of the research goals as well as the book's structure. Analyzing three central linguistic variables – third person plural pronouns, relativization patterns, and light verb constructions – Bergs explains why he has chosen to study variation in the Paston letters using a sociohistorical approach and social network theory. Presenting research material and his object of investigation in chapter 2, the author introduces the notion of historical sociolinguistics. Taking into account extralinguistic evidence, data, and theories, historical sociolinguistics must be viewed as an independent discipline, separate from present-day sociolinguistics and traditional historical linguistics. The third chapter considers ideas, principles, and methods underlying and constituting social network analysis. Giving a comprehensive theoretical background related to the above-mentioned issues, Bergs develops a network for the Paston family from both egocentric and sociocentric perspectives. A detailed description of the corpus used in the study is also presented. According to Bergs, the question of authorship does not play such an important role in morphosyntactic variables as in phonological or graphological ones.