John Tyndall and the Early History of Diamagnetism.

In the last few days of 1849 – he was even at work on Christmas Day and missed going out with his friends Debus and Bromeis on New Year's Eve – it struck him that the cleavage rather than the optic axis of the crystal might be significant, an idea that would become the basis of his beliefs about the importance of molecular structure, and would become particularly significant in his later work on glaciers.

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