This collection of papers has its origin in a conference held at the Uni- versity of Toronto in June of 1988. The theme of the conference was Physicalism in Mathematics: Recent Work in the Philosophy of Math- ematics. At the conference, papers were read by Geoffrey Hellman (Minnesota), Yvon Gauthier (Montreal), Michael Hallett (McGill), Hartry Field (USC), Bob Hale (Lancaster & St Andrew's), Alasdair Urquhart (Toronto) and Penelope Maddy (Irvine). This volume supplements updated versions of six of those papers with contributions by Jim Brown (Toronto), John Bigelow (La Trobe), John Burgess (Princeton), Chandler Davis (Toronto), David Papineau (Cambridge), Michael Resnik (North Carolina at Chapel Hill), Peter Simons (Salzburg) and Crispin Wright (St Andrews & Michigan). Together they provide a vivid, expansive snapshot of the exciting work which is currently being carried out in philosophy of mathematics. Generous financial support for the original conference was provided by the Social Sciences & Humanities Research Council of Canada, the British Council, and the Department of Philosophy together with the Office of Internal Relations at the University of Toronto. Additional support for the production of this volume was gratefully received from the Social Sciences & Humanities Research Council of Canada.

Approximately five years have elapsed since the Conference on "Tick-borne Diseases and their Vectors" (Wilde, 1978, University of Edinburgh) was held at the Centre for Tropical Veterinary Medicine in Edinburgh. Theileriosis was one of the main topics at that Conference and some 20 scientific presentations were given. Also in the same year a Workshop on "Theileriosis" was held at the Kenyatta Conference Centre in Nairobi (Henson & Campbell, 1977, IDRC, Ottawa). Both of these meetings provided a valuable up dating of theilerial diseases, and the Proceedings have been a constant source of reference for scientists in the ensuing years. The meetings played a significant role in setting the scene for a number of important advances which have been made since then. In February of this year, attention was focused on these advances when nearly 200 scientists from over 30 countries were assembled at the International Laboratory for Research on Animal Diseases in Nairobi for the international conference on "Advances in the Control of Theileriosis." The interest and concern shown in this subject has now grown to the extent that more than 70 scientific presentations were given over the course of a very busy week. An important facet of the Conference was the attention given to the control of Theileriosis, since this must be the ultimate aim of all those involved with the disease. Control will be difficult."

This collection of papers has its origin in a conference held at the Uni- versity of Toronto in June of 1988. The theme of the conference was Physicalism in Mathematics: Recent Work in the Philosophy of Math- ematics. At the conference, papers were read by Geoffrey Hellman (Minnesota), Yvon Gauthier (Montreal), Michael Hallett (McGill), Hartry Field (USC), Bob Hale (Lancaster & St Andrew's), Alasdair Urquhart (Toronto) and Penelope Maddy (Irvine). This volume supplements updated versions of six of those papers with contributions by Jim Brown (Toronto), John Bigelow (La Trobe), John Burgess (Princeton), Chandler Davis (Toronto), David Papineau (Cambridge), Michael Resnik (North Carolina at Chapel Hill), Peter Simons (Salzburg) and Crispin Wright (St Andrews & Michigan). Together they provide a vivid, expansive snapshot of the exciting work which is currently being carried out in philosophy of mathematics. Generous financial support for the original conference was provided by the Social Sciences & Humanities Research Council of Canada, the British Council, and the Department of Philosophy together with the Office of Internal Relations at the University of Toronto. Additional support for the production of this volume was gratefully received from the Social Sciences & Humanities Research Council of Canada.

Approximately five years have elapsed since the Conference on "Tick-borne Diseases and their Vectors" (Wilde, 1978, University of Edinburgh) was held at the Centre for Tropical Veterinary Medicine in Edinburgh. Theileriosis was one of the main topics at that Conference and some 20 scientific presentations were given. Also in the same year a Workshop on "Theileriosis" was held at the Kenyatta Conference Centre in Nairobi (Henson & Campbell, 1977, IDRC, Ottawa). Both of these meetings provided a valuable up dating of theilerial diseases, and the Proceedings have been a constant source of reference for scientists in the ensuing years. The meetings played a significant role in setting the scene for a number of important advances which have been made since then. In February of this year, attention was focused on these advances when nearly 200 scientists from over 30 countries were assembled at the International Laboratory for Research on Animal Diseases in Nairobi for the international conference on "Advances in the Control of Theileriosis." The interest and concern shown in this subject has now grown to the extent that more than 70 scientific presentations were given over the course of a very busy week. An important facet of the Conference was the attention given to the control of Theileriosis, since this must be the ultimate aim of all those involved with the disease. Control will be difficult."