When the atmospheric fluid is homogenous and of equal density, the rays of light pass without obstruction or alteration in their shape or direction; but when they enter from a rarer into a denser medium, they are refracted or bent out of their course; and this with greater or less effect according to the different degrees of density in the media, or the deviation of the ray from the perpendicular.

Without a social capital, with twenty or more communities divided by distance and political barriers, her people, who are really more homogenous than any other of the same numbers in the world perhaps, possess no standard for opinion, manners, social maxims, or even language.

Coming as it does, from different parts of this vast country, the population of a new settlement, while it is singularly homogenous for the circumstances, necessarily brings with it its local peculiarities.

"The drop of water is not a homogenous mass.