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 Ciba-Geigy AG, the big Swiss chemicals company, said 
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that it agreed in a letter of intent with Corning Inc. to acquire Corning's 50% share of Ciba Corning Diagnostics Corp., 
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based in Medfield, Mass.
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 Ciba Corning, 
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which had been a 50-50 venture between Basel-based Ciba-Geigy and Corning, 
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has annual sales of about $300 million,
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 the announcement said.
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 Terms of the transaction weren't disclosed.
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 Ciba Corning makes clinical diagnostics systems and related products for the medical-care industry.
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 The announcement said 
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the acquisition should be completed by December
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 after a definitive agreement is completed 
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and regulatory approval is received.
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 Ciba-Geigy intends to develop the Ciba Corning unit into a substantial business,
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 making the unit an integral part of Ciba-Geigy's comprehensive disease management concept.
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