1  Disk assembly (stainless support disk)may be obtained from Millipore Corp.,Ashley Rd.,Bedford,MA01730.

2  Asuitable device is the watchglass-patch-polytef mesh sandwich assembly available as the Transdermal SandwichTMfrom Hanson Research Corp.,9810Variel Ave.,Chatsworth,CA91311.

3  Use Dow Corning,MD7-4502Silicone Adhesive 65%in ethyl acetate,or the equivalent.

4  Use Cuprophan,Type 150pm,11±0.5-µm thick,an inert,porous cellulosic material,which is available from Medicell International Ltd.,239Liverpool Road,London NI ILX,England.

5  The cylinder stirring element is available from Accurate Tool,Inc.,25Diaz St.,Stamford,CT06907,or from VanKel Technology Group,13000Weston Parkway,Cary,NC27513.

6  The materials should not sorb,react with,or interfere with the specimen being tested.

7  The reciprocating disk sample holder may be purchased from ALZA Corp.,1900Charleston Road,P.O.Box 7210,Mt.View,CA94039–7210or VanKel Technology Group.