nearly balanced upon one of the V-edges as to rest but. lightly upon the other. A notch is filed in the carbon rod at its balancing point. It is interesting to observe that the same microphone has served for forks of differ ent pitch—the deep bass F and the middle A for in Dr. Haig believes there is a relation between reten tion of uric acid in the blood and a state of mental despondency. When uric acid is present in excess de but give place to a feeling of mental buoyancy when ELECTRICALLY OPERATED TUNING FORK., scientific american, 1890-02-22
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