Surprisingly little is known about the amount, location, chemical combination and function of calcium, magnesium and phosphorus in foetal tissues. The present work was inspired by this comparative ignorance coupled with the availability of some fresh, well-dated foetal material from the pig and the rabbit. Some human foetuses have also been analysed, and the relevant literature will be mentioned with the presentation of the results. Some information about the physicochemical structure of embryonic cells and fluids has already been published (
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