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Twenty-four-hour urines were collected as follows: The first morning specimen of the collection day was discarded. Urine was then collected throughout the remainder of that day and night. The collection was then completed with the inclusion of the first specimen of the following morning.

The relation of sodium to hypertension remains one of the most fascinating problems in medicine.The results accumulated over a five-year period of study of this relationship are presented in the paper which follows. In these investigations the appetite for salt and the output of

This paper summarizes the incidence of various arrhythmias in an unselected series of cardiac catheterizations and presents evidence for their reflex origin in some instances. The hazards are discussed and comments made about prophylaxis and treatment.