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Males have often been neglected in both family planning programmes and in surveys used to design and evaluate such programmes. A 1988 study on fertility, family planning and AIDS in Kinshasa, Zaire, provides comparable data on 3140 men and 3485 women of reproductive age which served as the basis for analysing male/female differences. The study indicated a fair degree of similarity in the attitudes, beliefs, knowledge levels and practices of men and women regarding fertility and family planning. Where they differed (e.g. on expected or ideal number of children, the desire for more children at parity 7 or above), men tended to be more pronatalist than women. The implications of the findings for future family planning programmes are discussed. Programmes should target males because of their role as decision makers within Zairian society.

2613such as W,---W, would not require any thermal activation energy. ConclusionDecatungstate appears to be a promising candidate for photochromic applications due to the high values of the extinction coefficients. Moreover, the simultaneous uptake of two electrons in certain media should be useful for photocatalytic applications (water splitting for instance).Acknowledgment. We thank F. Babonneau for computer simulations and helpful discussions on optical spectra.Variable-temperature Mossbauer, magnetic susceptibility, and infrared studies of F e (~h e n )~( N c B H & reveal the occurrence of a reversible, gradual singlet/quintet intersystem crossing above room temperature. Mossbauer spectra of the complex in the transition region are interpreted as showing the Occurrence of a novel (for Fe(II)), fast singlet/quintet interconversion.

We report on the design, construction, and operation of a time-resolved emission Mössbauer spectrometer which has as its central component a microcomputer for data recording and manipulation. The philosophy of data acquisition affords previously unrealized flexibility in data handling and spectral analysis in both the time and frequency domains.

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