The Vatican Observatory at Castel Gandolfo, Italy, and the Vatican Observatory Research Group in Tucson, Arizona, hosted many visitors throughout the year. The number of school groups received by MAFFEO at Castel Gandolfo was particularly noteworthy.

We were privileged to have a visit by the Ambassador of the United States to the Holy See, Mrs. Corinne C. Boggs.

The Vatican Observatory hosted several visits to its headquarters in Castel Gandolfo: participants at the meeting "Galaxy Disks and Disk Galaxies" visited the Observatory and the Pontifical Villa at Castel Gandolfo. Hosted also were the members of the Pontifical Academy of Sciences on the occasion of the Plenary Session of the Academy in November, as well as groups from the John Templeton Foundation and the Peter Gruber Foundation.

The following individuals paid extended working visits to the Observatory:

AJOY K. DASGUPTA, Institute of Astronomy, University of Rome "La Sapienza," Rome, and South Glamorgan Education Department, Cardiff, UK

FRAN€OIS EVAIN, S.J., Jesuit Community, Rouen, France

JAVIER IGEA, priest of the Diocese of Toledo, Spain

ROBERT JANUSZ, S.J., Krakow, Poland

ALGIS KAZLAUSKAS, Institute of Theoretical Physics and Astronomy, Vilnius, Lithuania

A. G. DAVIS PHILIP, Union College and Institute for Space Observations, Schenectady, New York, USA

JULIUS SPERAUSKAS, Vilnius University, Vilnius, Lithuania

JACK WISDOM, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA

The following participated in the meeting on "Quantum Physics and Quantum Field Theory" held at Castel Gandolfo from 25 June to 1 July:

MICHAEL BERRY, H. H., Wills Physical Laboratory, Bristol, UK; JEREMY BUTTERFIELD, Cambridge, UK; RAYMOND CHIAO, Department of Physics, University of California, Berkeley, California, USA; CHRIS CLARKE, Faculty of Mathematical Studies, University of Southampton, UK; PHILIP CLAYTON, Department of Philosophy, Sonoma State University, California, USA; JAMES T. CUSHING, Department of Physics, University of Notre Dame, South Bend, Indiana, USA; GEORGE F. R. ELLIS, University of Cape Town, South Africa; MICHAEL HELLER, Pontifical Theological Academy, Krakow, Poland; PAVEL KAPUSTA, S.J., Frankfurt am Main, Germany; JOHN LUCAS, Somerset, UK; ERNAN T. MCMULLIN, University of Notre Dame, South Bend, Indiana, USA; NANCEY MURPHY, School of Theology, Fuller Theological Seminary, Pasadena, California, USA; TED PETERS, Pacific Lutheran Seminary, Berkeley, California, USA; JOHN POLKINGHORNE, Cambridge, UK; MICHAEL REDHEAD, London, UK; ROBERT J. RUSSELL, Center for Theology and the Natural Sciences, Berkeley, California, USA; ABNER E. SHIMONY, Wellesley, Massachusetts, USA; OWEN THOMAS, Berkeley, California, USA; THOMAS F. TRACY, Department of Philosophy and Religion, Bates College, Lewiston, Maine, USA; KIRK WEGTER-MCNELLY, Center for Theology and the Natural Sciences, Berkeley, California, USA; CARL YORK, Center for Theology and the Natural Sciences, Berkeley, California, USA.

Other professional guests of the Observatory at either Castel Gandolfo or Tucson during the year included: CLAUDIO CASACCI, Alenia Aerospazio, Turin, Italy; ENRICO M. CORSINI, Asiago Observatory, University of Padua, Italy; DARBY DYAR, Mount Holyoke College, Massachusetts, USA; FRAN€OIS EUV�, S.J., Centre Sevres, Paris, France; JOHN FALLON, Diocese of Fargo, North Dakota, USA; JEAN-BAPTISTE KIKWAYA, S.J., Bureau de Longitude, Mecanique Celeste, Paris, France; DANTE MINNITI, Pontificia Universidad Catolica de Cile, Santiago, Chile; FRANCISCO PRADA, Calar Alto Observatory, Spain; GIUSEPPE RACCA, Scientific Projects Department, European Space Agency, Paris, France; PIERO RAFANELLI, Department of Astronomy, University of Padua, Italy; REMO RUFFINI, University of Rome "La Sapienza," Italy; FILIPPO SMRIGLIO, Institute of Astronomy, University of Rome "La Sapienza," Italy; ROBERTO SOMMA, Alenia Aerospazio, Rome, Italy; DAVID VAN DE PUTTE, Astronomy Centre, University of Sussex, UK; FRANK YOUNGER, Dominion Astrophysical Observatory, Victoria, Canada.