But under the seething surface—first visible to the casual glance—was a substratum as pure as it was solid and unyielding.
The bottom was quite even and flat, resting upon a substratum of coral.
There, as here, the substratum is porous limestone; and it is the subsidence of the layers which gives birth to the springs.
The substratum was showing itself for a moment in the character of the Countess.
While many forms are fixed to the substratum, others are free, being in this condition either motile or immotile.
But the "substratum" of the soul must be something else in addition to this.
The highest, truest love has its substratum of common sense, self-restraint, and thought for others.
There was some substratum of sense in Beaumanoir's chaffing.
The print adheres firmly to the plate when the substratum is not over-printed.
There is a substratum of iniquity lower than any writers have ever touched.