Ablaut, Laryngeals, and Saussure


present tense
future tense
infinitive
Sanskrit
युनकति
पुनाति
योकश्ष्यति
पविष्यति
योकतुम्
पवितम
Transliterated
yunakti 'joins'
punAti ' cleanses'
yoksyati 'will join'
pavisyati 'will cleanse'
yoktum 'to join'
pavitum 'to cleanse'
remove infixes and endings
yuk with infix
punA?
yok

pavi?
yok

pavi?
reconstruct back
zero grade with infix na
pu (zero grade) + na + whatever X lengthens the vowel
o-grade (goes back to *eu)
pav < *peu, but with an i (why? call it X)
o-grade (goes back to *eu)
pav < *peu, but again i (why? call it X)
Saussure's observed underlying structure
*yu-na-k-ti
*pu-na-X-ti
*yeuk-syati
*peuX-syati
*yeuk-tum
*peuX-tum
Underlying structure more generally represented
*CV-na-C-ti
*CV-na-X-ti
*CVC-syati
*CVX-syati
*CVC-tum
*CVX-tum
Remove the -na- infix from Saussure's underlying structure to see root structure
*yu-k-ti
*pu-X-ti
remember: X is a variable, not a specific sound
*yeuk-syati
*peuX-syati
*yeuk-tum
*peuX-tum
More generally represented
*CVC-ti
*CVX-ti
*CVC-syati
*CVX-syati
*CVC-tum
*CVX-tum
conclusion
k corresponds to X: that will reduce the number of different paradigms (a good thing) ...
... something caused X ...
... but it's not there, so let's hypothesize it into existence: laryngeal! (he just labeled it as a missing phoneme)

Just for yuks.