Verner's Law
Branch: GermanicDiscovered by Karl Verner (1875)
PGmc *f, *þ, *h, *s → *b, *d, *g, *z when PIE accent was not on the immediately preceding syllableExplains exceptions to Grimm's Law: PIE voiceless stops became voiced fricatives in Proto-Germanic when the preceding syllable did not bear the PIE accent. Discovered by Karl Verner in 1875, it resolved the apparent irregularities in Grimm's Law and confirmed the importance of accent in PIE.
Sound Correspondences
| PIE Form | Reflex | Environment | Examples |
|---|---|---|---|
*p → PGmc *f | PGmc *b (voiced) | PIE accent not on preceding syllable | *ph₂tḗr → *fadēr (not **faþēr); cf. *bʰréh₂tēr → *brōþēr (accent precedes) |
*t → PGmc *þ | PGmc *d (voiced) | PIE accent not on preceding syllable | *ph₂tḗr → *fadēr; past participles with shifted accent |
*k → PGmc *h | PGmc *g (voiced) | PIE accent not on preceding syllable | Grammatischer Wechsel in strong verb paradigms |
*s | PGmc *z (→ *r by rhotacism) | PIE accent not on preceding syllable | *h₁es- → was/were (s~r alternation from *s~*z) |
Discussion
Verner's Law, published by Danish linguist Karl Verner in 1875 in his paper "Eine Ausnahme der ersten Lautverschiebung," resolved one of the most troubling problems in 19th-century comparative linguistics: the apparent exceptions to Grimm's Law.
After Grimm's Law had been formulated, scholars noticed that in some positions the expected voiceless fricatives (*f, *þ, *h) appeared instead as voiced fricatives (*b, *d, *g). The conditioning factor, Verner demonstrated, was the position of the PIE accent. When the accent fell on the syllable immediately preceding the consonant in question, Grimm's Law applied normally. When the accent was elsewhere, the resulting fricative became voiced.
The classic example involves the PIE word for 'father': *ph₂tḗr, with accent on the final syllable. Grimm's Law correctly predicts *p → *f, but the *t, being in a post-tonic position, became *d rather than the expected *þ, giving Proto-Germanic *fadēr rather than the expected **faþēr. Compare this with *bʰréh₂tēr 'brother,' where the accent precedes the *t, giving the expected *þ in Proto-Germanic *brōþēr.
Verner's Law also affected *s, which became *z in the same environment. This *z later became *r in the North and West Germanic languages through rhotacism, explaining alternations like English was/were (where the *s/*z alternation reflects the original accent pattern).
The discovery was a triumph for the Neogrammarian hypothesis that sound laws admit no exceptions. What had seemed like random irregularities turned out to be perfectly regular once the conditioning factor of PIE accent was understood. Verner's Law remains one of the most elegant demonstrations in historical linguistics.