The elastic and nucleus-fibres enter, more or less, and sometimes in very considerable quantity, into the composition of the most varied new growths, although in no instance are the latter entirely composed of them.

We have, however, occasionally observed accumulations of elastic fibres, in the arrangement and form proper to the vocal chords, beneath the mucous membrane of the trachea, and close to the larynx.

With reference to the texture of the annulo-fibrous membrane, we have, in one instance, seen the muscular fibres of a hypertrophied, solidified, rigid, muscular tunic of the urinary bladder converted into dingy yellow, elastic bands, which presented a texture exactly like that of the annulo-fibrous membrane of arteries. A transformation of one texture-species, pertaining to a common genus, into another.