He's had another of his evolutions.
In the sequel he prepared a new evolutionary signal-book, which was adopted by the royal navy, and still remains in substance the foundation of the existing system of tactical evolutions at sea.
Thus it was, partly because the habit of acceptance of authority, waning but far from extirpated, dictated to the clinical observer what he should see; partly because the eye of the clinical observer lacked that special training which the habit and influence of experimental verification alone can give, that physicians, even acute and practised physicians, failed to see many and many a symptomatic series which went through its evolutions conspicuously enough, and needed for its appreciation no unknown aids or methods of research, nor any further advances of pathology.
But, if he have patience, he will see it mount aloft and there execute a series of aerial evolutions of an astounding kind.
In the breeding-season, however, it is as noisy and conspicuous as its larger brethren while executing its aerial evolutions.
