Táim ag léamh cúpla leabhar ag baint le Eoin MacNeill agus an Ghaeilge ach nílim ábalta rudaí difriúla a thuiscint. Bhíos ag súil go mbeadh fonn ar dhuine éigin anseo iad a mhiniú

Cad é 'Cath Ruis na Rig'
'Leabhar na hUidhre'
'Trí Bhiorghaoithe an Bháis' le Séathrún Céitinn agus cad a chiallaíonn siad as Béarla?

Ag féachaint ar a chuid taidghe a dhein sé mar gheall ar an nGaeilge: nílim ro-eolasach leis na téarmaí agus cad a chiallaíonn siad:

On the Irish Inifinitive:
The Substantive is genitive or dative relative when locution is genitive/dative relative

On the Ogham Alphabet:(as píosá le Brian ó Cúiv)
Mac Neill observed that in words more than one syllable when any liquid is followed by a short syllable ending in l or n the later consonants acquire their strong value and are written ll or nn. Tugtar MacNeill's Law air sin.

An féídír le aon duine iad thuas a mhiníu domsa?
Go raibh maith agat,
P.

One pattern that might have existed was a liquid was long between two long and/or stress vowels, or followed by a short and/or unstress vowel.

Between two unstress vowel and after a long/stressed vowel it seems to be short

In Mayo, at the beginning of a word, when it is Consonants + Liquid, the liquid is short

BUT, I'd imagine int he need to create minimal pairs and other things, the rules (what ever the idealised one were) were modified

'Cath Ruis na Rig' - 'Cath Ros na Rí'
'Leabhar na hUidhre' - 'The Book of the Dun Cow'
'Trí Bhiorghaoithe an Bháis' - 'The Three Shafts of Death'

Breis eolais faoin gCéitinneach, agus an saothar thuas, luaite anseo

http://www.ucc.ie/celt/keat_cunn.html