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The formula for Perenyi's fluid is as follows: 4 parts 10 per cent nitric acid; 3 parts alcohol; 3 parts 0.5 per cent chromic acid.

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This article is intended to serve as an introduction to the concept of the marriage contract, which has proved to be a useful clinical tool for clarification and treatment of troubled marriages. Transactional as well as intrapsychic factors are important aspects of marital dynamics. The contract concept employs both these behavioral parameters and facilitates therapeutic intervention at both levels.