The characteristics of each of these sub-classes is indicated by its name.
The Sub-classes must be opposed or mutually exclusive: Species must not overlap.
The Anthozoa are divisible into two sub-classes, sharply marked off from one another by definite anatomical characters.
This, of course, involves the developing of new concepts to cover these sub-classes.
Each of these classes was divided into two sub-classes: the Theoretical into 1.
These were again subdivided, each into two sub-classes; the Gymnastic, into 1.
This smeared class embraces two sub-classes, clerks or accountants, and journalists.
Gnther divides the Fishes into six sub-classes, which are further arranged in thirteen orders.
The other three of the four first-trained men explained every move to sub-classes assigned to each.
We may either divide colour straight away into red, blue, white, etc.; or we may divide each class into two sub-classes.