My writing career has been, at least in this one respect, idiosyncratic: it had to mark and chart, step by step, its own peculiar champaign. My earliest papers, beginning in 1942, were technical articles in this or that domain of Uralic linguistics, ethnography, and folklore, with a sprinkling of contributions to North and South American linguistics. In 1954, my name became fecklessly associated with psycholinguistics, then, successively, with explorations in my thology, religious studies, and stylistic problems. It now takes special effort for me to even revive the circumstances under which I came to publish, in 1955, a hefty tome on the supernatural, another, in 1958, on games, and yet another, in 1961, utilizing a computer for extensive sorting of literary information. By 1962, I had edged my way into animal communication studies. Two years after that, I first whiffled through what Gavin Ewart evocatively called "the tulgey wood of semiotics." In 1966, I published three books which tem porarily bluffed some of my friends into conjecturing that I was about to meta morphose into a historiographer of linguistics. The topmost layer in my scholarly stratification dates from 1976, when I started to compile what eventually became my "semiotic tetralogy," of which this volume may supposably be the last. In the language of "Jabberwocky," the word "tulgey" is said to connote variability and evasiveness. This notwithstanding, the allusion seems to me apt.

This volume focuses on Berkeley's doctrine of signs. The 'doctrine of signs' refers to the use that Berkeley makes of a phenomenon that is central to a great deal of everyday discourse: one whereby certain perceivable entities are made to stand in for (as 'signs' of) something else. Things signified might be other perceivable entities or they might also be unperceivable notions - such as the meanings of words. From his earliest published work, A New Theory of Vision in 1710, to those works written towards the end of life, including Alciphron in 1732, Berkeley is at pains to emphasise the crucial role that sign-usage, particularly (but not only) in language, plays in human life. Berkeley also connects sign-usage to our (human) relationship with God: an issue that was right of the heart of his philosophical project. The contributions in this volume explore the myriad ways that Berkeley built on such insights to better understand a range of philosophical issues - issues of epistemology, language, perception, mental representation, mathematics, science, and theology. The aim of this volume is to establish that the doctrine of signs can be seen as one of the unifying themes of Berkeley's philosophy. What's more, this theme is one which spans his whole philosophical corpus; not just his best-known works like the Principles and the Three Dialogues, but also his works on science, mathematics, and theology.