ARTICLES 



597 



In a remarkable series of experiments, Tyndall {On Dia- 

 magnetism and Magneto-cry stallic Action, 1870) has shown that 

 the deportment of crystals suspended in a magnetic field is 

 closely linked up with the orientations of the principal planes 



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of cleavage. Tyndall sought^to explain these effects as due 

 to reciprocal molecular induction, an explanation plausible 

 enough in the case of ferro-magnetic media, but hardly likely 

 to be applicable in the case of diamagnetic media as they were 

 then understood. The simple diamagnetic polarity is of so 



39 



