Definitions thus limited arise from ignorance of euphonic processes, or rather from an ignorance of the generality of their operation.

[§ 328]. Ordinary processes as opposed to extraordinary processes.—The whole scheme of language is analogical. A new word introduced into a language takes the forms of its cases or tenses, &c., from the forms of the cases or tenses, &c., of the old words. The analogy is extended. Now few forms (if any) are so unique as not to have some others corresponding with them; and few processes of change are so unique as not to affect more words than one. The forms wept, and slept, correspond

with each other. They are brought about by the same process: viz., by the shortening of the vowel in weep and sleep. The analogy of weep is extended to sleep, and vice versâ. Changing our expression, a common influence affects both words. The alteration itself is the leading fact. The extent of its influence is an instrument of classification. When processes affect a considerable number of words, they may be called ordinary processes; as opposed to extraordinary processes, which affect one or few words.

When a word stands by itself, with no other corresponding to it, we confess our ignorance, and say that it is affected by an extraordinary process, by a process peculiar to itself, or by a process to which we know nothing similar.

A definition of the word irregular might be so framed as to include all words affected by extraordinary processes; the rest being considered regular.

[§ 329]. Positive processes as opposed to ambiguous processes.—The words wept and slept are similarly affected. Each is changed from weep and sleep respectively; and we know that the process which affects the one is the process that affects the other also. Here there is a positive process.

Reference is now made to words of a different sort. The nature of the word worse has been explained in the Chapter on the Comparative Degree. There the form is accounted for in two ways, of which only one can be the true one. Of the two processes, each might equally have brought about the present form. Which of the two it was, we are unable to say. Here the process is ambiguous.

A definition of the word irregular might be so framed as to include all words affected by ambiguous processes.

[§ 330]. Normal processes as opposed to processes of

confusion.—Let a certain word come under class A. Let all words under class A be similarly affected. Let a given word come under class A. This word will be affected even as the rest of class A is affected. The process affecting, and the change resulting, will be normal, regular, or analogical.