Abstract
I HAVE read with interest Dr. Lambert's letter in NATURE of October 18 with reference to the earth tides observed by means of Hecker's horizontal pendulums at Potsdam. These indicated a greater rigidity on the earth in a direction a little north of west and south of east. I connected this with the prevailing west-north-west and east-south-east strike of the folds of the rocks to the south, and probably also of those underlying the point of observation.
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