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12 analysed carefully the Psychology of the processes for the Summation of Series and for solving Quadratic Equations; as well as that of the Fluxion method.

instituted a series of investigations on Force-lines as co-ordinates for illustration of Laws of Thought. At the same time he corresponded with ladies on Mission Stations and other persons residing in Volcanic districts, who, during many years, sent to him observations on minute points connected with seismic disturbance. After a life of heroic struggle against many difficulties, he published a book, Force and Nature, in which he advanced a psychologic theory connected with Geologic Evolution, which at some points coincided with the theories of J. Hinton; at some with that of Betts; at others, again, it reminded me of my husband's system of psychologic co-ordination. He and James Hinton once compared notes in my presence.

The late was well known as a physician. It was not so well known that he had made a profound study of the effect on the nerves and brain of periodic alternation of mental attitude; not mere repose, but reversal of attitude as preparation for repose. He believed