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75. The addition of any inflection beginning with a vowel will hinder the formation of a diphthong, or the lengthening of a vowel.
| Diphthong. | No Diphthong. | Diphthong. |
| meall | meallaim | meallta |
| gleann | gleanna | gleannta |
| gall | gallaiḃ | gallda |
| caill | caillim | caillte |
| crom | cromann | cromṫa |
| poll | ṗollas | pollta |
| am | amanta | |
| cam | camaim | camfad |
| geall | geallaim | geallfad |
| Long. | Short. | Long. |
| gearr | gearraim | gearrṫa |
| bearr | bearraḋ | ḃearrfá |
| fearr | fearra | feirrde |
| luing | luingeas | luingséoir |
| coill | coille | coillte |
| fill | fillim | fillfad |
| binn | binne | |
| tonn | tuinne | tonnta |
76. The development of a helping vowel (§ 124) will prevent a diphthong, or a long vowel, being produced,
Donnċaḋ (=Donnaċa); dorċa (=doraċa); bolg (= bolag); guirm (= guirim); luimniġ (=luiminiġ); carn (=carn), &c.
