The values in other cases are **calculable** from the formula RI 09° 28' - a), where a is the internal angle of the regular polygon contained by sides equal in number to the number of the carbon atoms composing the ring.

While polysymmetry is solely conditioned by the manner in which the mimetic twin is built up from the single crystals, there being no change in the scalar properties, and the vector properties being **calculable** from the nature of the twinning, in the case of polymorphism entirely different structures present themselves, both scalar and vector properties being altered; and, in the present state of our knowledge, it is impossible to foretell the characters of a polymorphous modification.

The line BC, representing the equilibrium between monoclinic and liquid sulphur, is thermodynamically **calculable**; the point B is found to correspond to 131° and 400 atmospheres.

Koenig constructed a series of bars forming a harmonicon, the frequency of each bar being **calculable**, and he found the limit to be between 16,000 and 24,000.

Hence to give a margin of safety to cover contingencies not **calculable**, an excess of material must be provided.

On account of the great size of this table, and for other reasons, it never 2 The smallest number of entries which are necessary in a table of logarithms in order that the intermediate logarithms may be **calculable** by proportional parts has been investigated by J.

On the Copernican change the heavenly bodies were recognized as concrete and yet subject to **calculable** law.

These constants are determined by the data of the system (radii, thicknesses, distances, indices, &c., of the lenses); therefore their dependence on the refractive index, and consequently on the colour, are **calculable** (the formulae are given in Czapski-Eppenstein, G'rundziige der Theorie der optischen Instrumente (1903, p. 166).

We may not arrive at our port within a **calculable** period, but we would preserve the true course.