In bone it is infiltrated with salts which give bone its hardness, and make it seem so unlike other tissues.

'On examining the leg I found the subcutaneous tissues infiltrated from below the knee to the foot, large masses of gelatinous blood-stained material being present along the flexor tendons and in the hollow of the heel.

In South America, and thence upwards to Mexico inclusive, the population has been infiltrated in some parts and transformed in others, by Spanish blood and by that of the Negroes whom they introduced, so that not one half of its population can be reckoned as of pure Indian descent.

During these years, Negroes gradually invaded Indian Territory and increased the number already infiltrated into and assimilated by the Indian nations.

Why does the slave-soul infiltrate like a cancer the soul of society with its black fluid?