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Bartsch's law

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Bartsch's law

In historical linguistics, Bartsch's law or the Bartsch effect (French: loi de Bartsch or effet de Bartsch) is the name of a sound change that took place in the early history of the langues d'oïl, for example in the development of Old French.


Bartsch's law was a phonetic change affecting the open central vowel [a] in northern Gallo-Romance dialects in the 5th-6th century. This vowel, inherited from Vulgar Latin, underwent fronting and closure in stressed open syllables when preceded by a palatal or palatalized consonant. The result of this process in Old French was the diphthong [ie]:

Latin laxāre /lakˈsaːre/ > Old French laissier [lajˈsier] (modern French laisser "let")
Latin cārum /ˈkaːrum/ > Old French chier [ˈtʃier] (modern French cher "dear")

Note that [ie] is also the outcome of the diphthongization of [ɛ] in stressed, open syllables:

Latin pedem /ˈpedem/ > [ˈpɛdɛ] > [ˈpieðɛ] > Old French pie [ˈpie] (modern French pied "foot")

The chronology of Bartsch's law relative to the more general diphthongization of [a] to [aɛ] (responsible, for example, for the final vowels in mare > mer "sea" or portāre > porter "carry") has not been conclusively established.[1] According to one view, diphthongization took place first, and Bartsch's law is seen as a further segmentation of the diphthong [aɛ] caused by the preceding palatal/palatalized consonant, followed by simplification of the resulting triphthong:

IPA: [ˈa] > [ˈaɛ̯] > [ˈia̯ɛ̯] > [ˈiɛ̯] > [ˈie̯]
Romanicist notation: á > áę > íaę > íę > íẹ

According to a second view, Bartsch's law affected the simple vowel [a], causing it to change to [e], which then diphthongized to [ie]:

IPA: [a] > [e] > [ˈie̯]
Romanicist notation: a > ẹ > íẹ

Support for the second hypothesis comes the fact that palatal consonants triggered the same change [a] > [e] in unstressed word-initial syllables:[2]

Latin caballum /kaˈballum/ > [tʃeˈvallo] > Old French cheval [tʃəˈval] "horse"

Further development

Subsequent changes have obscured the effects of Bartsch's law in modern French. The accent shifted to the second element of the diphthong [ie], and the first element underwent glide formation:

in IPA: [ˈie̯] > [ˈi̯e] > [je]
in Romanist notation: íẹ > iẹ́ > yẹ

The glide [j] was then lost in most words, either absorbed by the preceding palatal consonant, or eliminated by analogical pressure (e.g. in many verbs of the -er conjugation):[3]

Old French chier [ˈtʃier] > [ʃjer] > modern French cher [ʃer] "dear"
Old French laissier [lajˈsier] > [lajˈsjer][lɛˈse], modern French laisser leˈse "let"

The glide was only retained if subsequent nasalization took place, as in Modern French chien "dog".[4]

Consequently, the vowel "e" in these words, which is due to Bartsch's law, is now indistinguishable from the "e" that resulted from the general diphthongization of [a] (as in the words mer "sea", porter "carry", mentioned above). The diphthong [ie] is still visible in the spelling of words like chien "dog" (< canem) and moitié "half" (< medietātem).


  1. ^ Laborderie (1994), p. 37
  2. ^ Zink (1986), p. 108, 115–117
  3. ^ Bourciez & Bourciez (1967), §41 Historique, p. 62
  4. ^ Buckley (2000), p. 5


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