From this we learn that the dual number is one of those inflections that languages drop as they become modern.

[§ 197]. The numbers, then, in the present English are two, the singular and the plural. Over what extent of language have we a plural? The Latins say bonus pater = a good father; boni patres = good fathers. In the Latin, the adjective bonus changes its form with the change of number of the substantive that it accompanies. In English it is only the substantive that is changed. Hence we see that in the Latin language the numbers were extended to adjectives, whereas in English they are confined to the substantives and pronouns. Compared with the Anglo-Saxon, the present English is in the same relation as it is with the Latin. In the Anglo-Saxon there were plural forms for the adjectives.

[§ 198]. Respecting the formation of the plural, the current rule is, that it is formed from the singular by adding s, as father, fathers. This, however, is by no means a true expression. The letter s added to the word father, making it fathers, is s to the eye only. To the ear it is z. The word sounds fatherz. If the s retained its sound the spelling would be fatherce. In stags, lads, &c., the sound is stagz, ladz. The rule, then, for the formation of the English plurals, rigorously, though somewhat lengthily expressed, is as follows.—The plural is formed from the singular, by adding to words ending in a vowel, a liquid or flat mute, the flat lene sibilant (z); and to words ending in a sharp mute, the sharp lene sibilant (s): e.g. (the sound of the word being expressed), pea, peaz; tree, treez; day, dayz; hill, hillz; hen, henz; gig, gigz; trap, traps; pit, pits; stack, stacks.

[§ 199]. Upon the formation of the English plural some further remarks are necessary.

a. In the case of words ending in b, v, d, the th in thine = ð, or g, a change either of the final flat consonant, or of the sharp s affixed, was not a matter of choice but of necessity; the combinations abs, avs, ads, aðs, ags, being unpronounceable.

b. Whether the first of the two mutes should be accommodated to the second (aps, afs, ats, aþs, aks), or the second to the first (abz, avz, adz, aðz, agz), is determined by the habit of the particular language in question; and, with a few apparent exceptions it is the rule of the English language to accommodate the second sound to the first, and not vice versâ.

c. Such combinations as peas, trees, hills, hens, &c., (the s preserving its original power, and being sounded as if written peace, treece, hillce, hence), being pronounceable, the change from s to z, in words so ending, is not a

matter determined by the necessity of the case, but by the habit of the English language.

d. Although the vast majority of our plurals ends, not in s, but in z, the original addition was not z, but s. This we infer from three facts: 1. From the spelling; 2. from the fact of the sound of z being either rare or non-existent in Anglo-Saxon; 3. from the sufficiency of the causes to bring about the change.