The difficulty in taking sweat during heavy physical exercise has drawn the authors into testing a technique of sampling generally used in paediatrics. The fact that the results, which have been dealt with statistically, should coincide with the physiological facts already published allows us to consider a use of the technique in order to investigate the physiological mechanisms in action during sweating under different metabolic conditions.

A technique is presented for continuous recording of [Formula: see text] of peritoneal fluid. It was shown that there was no difference in the utilization of different kinds of solutions in regard to the changes in [Formula: see text]. [Formula: see text] changes occurred more rapidly than ionic changes. Assisted ventilation rapidly modified [Formula: see text] levels in peritoneal fluid.

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