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Thus the delayed response to the sodium chloride infusion occurred only when the sodium balance of sodium-depleted sheep was significantly altered. Analysis of blood taken from the transverse facial artery of anresthetized sheep has shown that the sodium concentration rises by 7-35 m .equiv./1. during the infusion of 4 M sodium chloride at these rates into the corresponding carotid artery. These considerations indicate that the return to a normal value of the ratio sodium/potassium in the parotid saliva was not due to a direct effect of the increased sodium ion concentration in the blood perfusing the gland. It seems likely that the site of action of the

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The authors analyse some of the results of examination of 607 sterile patients, in which probatory excision from the testicles had been performed. They have reached the following conclusions. Testicular biopsy is a decisive diagnostic method in the case of a repeated finding of azoospermia. In these cases, the following three conditions must be satisfied before probatory excision is carried out:

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