Nucleated cell.
From Goeber.
1. Periphery of the
cell, or cell-wall.
2. Nucleus. 3. Nucleolus
in the center.]

A variety of tissues enters into the composition of an animal structure,
yet their differences are not always distinctly marked, since the
characteristics of some are not unlike those of others. We shall notice,
however, only the more important of the tissues.

The _Areolar_, or _Connective Tissue_, is a complete network of delicate
fibers, spread over the body, and serves to bind the various organs and
parts together. The fibrous and serous tissues are modifications of the
areolar.

The _Nervous Tissue_ is of two kinds: The gray, which is pulpy and
granulated, and the white fibrous tissue. The _Adipose Tissue_ is an
extremely thin membrane, composed of closed cells which contain fat. It
is found principally just beneath the skin, giving it a smooth, plump
appearance.

[Illustration: Fig. 5.
Arrangement of fibers in the
Areolar Tissue. Magnified 135 diameters.]

The _Cartilaginous Tissue_ consists of nucleated cells, and, with the
exception of bone, is the hardest part of the animal frame. The _Osseous
Tissue_, or bone, is more compact and solid than the cartilaginous, for