easy to determine. The application of the tests for its discovery requires judgment aud experience and should be repeatedly made before a definite opinion is formed. As, in the state of refraction kuowu as hypermetropia, the ciliary muscle, constantly called on to act to excess whenever any effort of vision is made, is often unable to fully relax when a glass neutralizing the hypermetropia is placed before it, so here, the muscle trained to excessive action often does not abandon such action readily and the true balance does not become apparent. It is therefore almost invariably better, even if tenotomy seems advisable, to precede it by the use of prisms for a few weeks. In this way we may learn
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