ACKNOWLEDGEMENTS

The silk and dried plant material samples used in this research were made available with the cooperation of Ms. Qian Xiaoping, Suzhou Silk Museum, Suzhou, China.

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AUTHOR INFORMATION

YUN YE is a Ph.D. candidate in the Materials Science Department at the California Institute of Technology. She received a B.S. in materials science from the Tsinghua University at Beijing, China, in 1995, and an M.S. in materials science from California Institute of Technology in 1997. Address: Mail code 138–78, Materials Science Department, California Institute of Technology, Pasadena, Calif. 91125

LYNN G. SALMON received a B.S. in materials science from the Massachusetts Institute of Technology and an M.S. in materials science from UCLA. Since 1986 she has been a research engineer at the California Institute of Technology, where she has conducted numerous studies of airborne pollutants in museums, national parks, and archaeological sites around the world. Address: Mail Code 138–78, Environmental Engineering Science Department, California Institute of Technology, Pasadena, Calif. 91125

GLEN R. CASS received his Ph.D. from the California Institute of Technology in 1978. At the time of this work he was a professor of environmental engineering and mechanical engineering at Caltech. He is presently chair of the School of Earth and Atmospheric Sciences at the Georgia Institute of Technology, Atlanta. Current research interests center on control of air pollution problems, including the problem of protection of works of art from damage due to air pollution. Address: School of Earth and Atmospheric Sciences, Georgia Institute of Technology, 221 Bobby Dodd Way, Atlanta, Ga. 30332

Received for review May 17, 1999. Revised manuscript received December 1, 1999. Accepted for publication March 14, 2000.