Wonderful as these senses are, yet, in the presence of many natural phenomena, they are very weak, and require help, in order that the operations of nature may be recognized. Take, as an illustration, the refined sense of sight. Light, coming from a distant star, is readily recognized; the same quantity of light coming from a house, half a mile distant, is even more distinctly sensed by the eye. In both these cases, though the light is recognized, the sensation is not so sharply defined as to produce a distinct image of the star or of the house. To make the images of distant objects distinct, the telescope has been invented; and this instrument is a most important aid to the sense of sight. The microscope is a similar aid to the eye, by which the lightrays coming from minute objects are so bent and arranged that the object appears magnified, and may be sensed in its details by the eye. The ear-trumpet is a similar device for collecting, concentrating and defining sound waves that ordinarily would be, to the ear, a confusion of sounds. The ear-trumpet is a mighty help to the sense of hearing. The light which passes through the lenses of the telescope and microscope, is the light which is ordinarily recognized by the eye. The instruments effect no change in the light; they merely arrange the waves so as to produce a clear and distinct outline of the objects from which the light comes. Likewise, the sound waves entering the ear-trumpet are in nowise changed in their essential nature, but are simply rearranged or concentrated to produce a more definite impression on the ear. Instruments similar to those here mentioned are the simplest aids to man's senses.