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Pythagoras likewise inculcated the famous numerical system of the monad, dyad, and triad; and by means of his sacred quaternary, elucidated the formation of the world, the arcana of nature, and the principles both of music and morals.
Tin is usually said to be dyad in stannous compounds and a tetrad in stannic compounds, but in a compound like SnCl AmCl, is not tin really a tetrad? and yet it is a stannous compound, and gives a black precipitate with H S; so that valency does not necessarily go with the series.
"Oh, I assure you, I am not yet convinced of that. Still, the audacity of your example will help me to remember ONE, whether or not you prove to be really unique." "Now, TWO, or the dyad, the origin of contrasts "
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