このところ集中的に調べている形容詞・副詞の比較級・最上級接尾辞の起源と発達について，古英語文法を著わした Campbell より，関連する記述を備忘録的に残しておきたい．
1. 形容詞の最上級接尾辞の異形とその発達（音変化） (§331.6; p. 139)
superlatives in -ōst- had -ūst- before u, as d.p. -ūstumiz, and hence OE has -ost < -ūst, beside -ast < -ōst (§355.4) . . . .
2. 形容詞の最上級接尾辞の異形の方言分布 (§657; pp. 272--73)
The superlative normally ends in -ost < -ust (§355.4), more rarely in -ast (§331.6), and may be declined both strong and weak. The formative element is often changed to -est by vowel harmony, especially in cases with -ost- (§385). In eW-S -ost-, -ast-, and the more archaic -ust- are used occasionally, but in all texts -est- prevails heavily. In lw-S and lNorth. -ost prevails (lNorth. also -ust-). In VP and Ru.1 it is not possible to determine if -ost- or -ast- originally prevailed in the dialects, in VP because all the forms have est- by harmony, in Ru.1 owing to entire absence of material. eKt. has -ast. KG has extended -est- to the uninflected form.
3. 形容詞の比較級・最上級接尾辞の起源 (§660; p. 277)
§660. Origin of forms. The comparative and superlative suffixes which caused mutation were Gmc. -izan-, -ista-, and these were regularly developed in OE, apart from the W-S syncopation in superlatives. The non-mutating suffixes were Gmc. -ōzan-, -ōsta-. The latter develops regularly to OE -ust, -ost, -ast (§331.6). The development of -ōzan- in OE is very difficult, as the invariable syncope of an originally long medial syllable has no parallel. It is a peculiarly OE development, even OFris. having -er-, a normal development of -ōz-, corresponding to OS, OHG -or-, ON -ar-, Goth. -ōz-. The OE form is presumably due to the influence of the comparatives in -iz-, in which syncope is normal. This suffix -iz- may have been used in Prim. OE, as in OHG, not only with the few a-, ō-stems with mutated comparatives, but with most i;̯a-, i;̯ō-stems, e.g. OE swētra is not from *su;̯ōtiōz- but *su;̯ōtiz-, cf. OHG suozziro. It would also probably be used with i-stem adjs. so far as these survived. Hence -r- < -iz- would be a very frequent comparative suffix, and might replace the form derived from -ōz- in the other adjectival classes.
4. 副詞の比較級・最上級接尾辞の起源 (§670; p. 277)
§670. Comparison of adverbs. Adjectival advs. have normally compar. -or, superl. -ost, e.g.:
hearde, severely heardor heardost
ġearwe, readily ġearwor ġearwost
-or also appears as -ur and -ar; -ost can appear as -ust, -ast (as in the superl. adj.). In origin -ost is merely the acc. sg. neut. of the superl. adjectival suffix. Compar. -or, -ur, -ar points to Gmc. -ōz, corresponding to Goth. -os. The final r (< z) should be lost in West Gmc., but is restored by analogy of the compar. adj.
・ Campbell, A. Old English Grammar. Oxford: OUP, 1959.
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