Another point of great importance is well brought out in the experiments of John Tyndall (Phil.
The experiments of Tyndall upon precipitated clouds have been already referred to.
Huxley, Tyndall, Cairnes, Mark Pattison, F.
His observations led him to the view that a glacier is an imperfect fluid or a viscous body which is urged down slopes of a certain inclination by the mutual pressure of its parts, and involved him in some controversy with Tyndall and others both as to priority and to scientific principle.
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