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India. They would give much information on the difference of character in the substrata below mountains and below sea. Long ago I suggested that the existence of mountains necessarily proved the existence of less-dense matter below then: and the Indian observations appear to support this view.
With regard to the kind of pendulum, I should prefer the invariable pendulum if it is certain that the surface of the knife-edge has been very carefully ground to contact with the surface to which it is screwed. I do not think that perfect confidence on a paint