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Accordingly, we shall recognise the same forms under other names; but at each return more specific and intense; and the whole process repeated with ascending gradations of reality, exempli gratiâ: Time + space = motion; Tm + space = line + breadth = depth; depth + motion = force; Lf + Bf = Df; LDf + BDf = attraction + repulsion = gravitation; and so on, even till they pass into outward phenomena, and form the intermediate link between productive powers and fixed products in light, heat, and electricity.

However, I do not study all the time, by any means. Mrs. Gordon grows more and more fond of me, and has me there to dinner or to tea continually. She has a much higher opinion of me than mother has, and is always saying the sort bf things that make you feel nice.

Since then the angle HBF is equal to PBA, and the angle BFG equal to QBC, it follows that the sine of the angle HBF will also have the same ratio to the sine of BFG, as the velocity of light in the medium A is to its velocity in the medium C. But these sines are the straight lines HF, BG, if we take BF as the semi-diameter of a circle.

The first law is that Natives belonging to class A may only intermarry with class B, and natives belonging to C may only intermarry with class D. The progeny of a man and woman of intermarrying classes is of a different class from either father or mother. Let Am represent a male of class A. Let Af represent a female of class A, and similarly Bm, Bf, &c.

On surmounting the saddle over which the road from the valley of Kwihara leads to Tabora, the plain on which the Arab settlement is situated lay before us, one expanse of dun pasture land, stretching from the base bf the hill on our left as far as the banks of the northern Gombe, which a few miles beyond Tabora heave into purple-coloured hills and blue cones.

Let Ap represent progeny who belong to class A, and similarly Bp, Cp, Dp. Law 2 may now be set down as under Af + Bm Am + Bf Cf + Dm Cm + Df Dp Cp Bp Ap The first law holds good with the progeny of these combinations, i.e., Dp can only marry one of class C though neither the father nor mother of Dp could marry into class C; similarly for Cp, &c.

For by drawing the other arc AD which cuts BF equally, and intersects FQ at S, this point will be the centre of the triangle. And it is easy to see that the arc SQ is the measure of the angle GCH in the figure which represents the crystal.

Taking, then, the parallelopiped AFB, of which the obtuse solid angle C is contained between the three equal plane angles, and imagining in it the three principal sections, one of which is perpendicular to the face DC and passes through the edge CF, another perpendicular to the face BF passing through the edge CA, and the third perpendicular to the face AF passing through the edge BC; I knew that the refractions of the incident rays belonging to these three planes were all similar.