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566.—But in sleep the distribution of the humors of the body goes on without let or hindrance; and, similarly, the circulation of the blood, the peristaltic action of the stomach, intestines and sphincters, and the respiratory movements continue their activity. This complex state of affairs—viz., the coexistence of quietude of certain parts of the body with continued motion in other parts—has made it difficult to ascertain the mechanical cause of sleep.^[7]

In his investigations into these subjects, von Haller placed his reliance mainly on vivisections and on experiments made upon animals. “A single experiment of this nature,” he said, “is often sufficient to disprove the deceptive conclusions or views that have prevailed through a period of years.” It is to John Hunter of England, however, says Puschmann, that the greatest credit is due for the introduction of the experimental method as a means of ascertaining the truth in questions of pathology; and von Haller was unquestionably one of the first German physicians to adopt the method.