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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.
we have the Tetrad indeed in the intellectual and intuitive contemplation, but a Triad in discursive arrangement, and a Tri-unity in result. Ib. p. 144.
There quoth Panurge, Is it here? How many steps have you told? asked our magnificent lantern. One, two, three, four, answered Pantagruel. How much is that? asked she. Ten, returned he. Multiply that, said she, according to the same Pythagorical tetrad. That is, ten, twenty, thirty, forty, cried Pantagruel. How much is the whole? said she. One hundred, answered Pantagruel.
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