If the field is uniform, H=O/**wd**, where 0 is the rotation, d the thickness of the substance arranged as a plate at right angles to the direction of the field, and w Verdet's constant for the substance.

This caused a disagreement between Alabama and the United States authorities; although it was amicably settled, it engendered a feeling that the pulicy of the national government might not be in harmony **wD**.h the interests of the state - a feeling which, intensified by the slavery agitation, did much to cause secession in 1861.

The resistance of the rope to bending causes an additional resistance, which experiment shows can be expressed in the form **Wd** 2 /cD where c is a coefficient.

Dp dpu dpv dpw -z)' reducing to the first line, the second line vanishing in consequence of the equation of continuity; and so the equation of motion may be written in the more usual form du du du du d dt +udx+vdy +**wdz** =X -n dx' with the two others dv dv dv dv i dp dt +u dx +v dy +w dz - Y -P d y' dw dw dw Z w dw i d p dt +u dx +v dy +**wd** - -P dz.