djwebb2021 wrote:
I was right all along -- as I showed. The Grammatical Tracts do not relate to modern Irish. O'Donovan's grammar of 1845 and Dinneen's dictionary are authoritative works relating to modern Irish.
First, let’s look at Dinneen’s dictionary (the second edition, but similar examples are in the first one too), we find among others
a haon or
ó ṁaidin go hoiḋċe, alongside
na h-uaire:

So, doesn’t seem an Duinníneach was very consistent here himself, whatever his views on the matter.
Also the passage from O’Donovan’s grammar you cited says nothing about h-prothesis – it’s exclusively about marking preposition + possessive pronoun compounds. Sure, O’Donovan himself uses the hyphen, but does he argue this is in any way “more correct” in his book? What he says about
h is:
As no word in Irish begins, in its radical form, with this consonant, it has been much disputed among Irish grammarians, whether it is a letter of the language or not; and the latest writers on the subject of philosophical or general grammar have stated that “the letter h is no articulate sound, but only a breathing.”
Thus, since it’s not a consonant in its full right, it doesn’t matter if you separate it with a hyphen or not, it’s always just a prefix (this, obviously, isn’t strictly true, there are modern borrowings starting with an actual /h/ written as
h, like eg.
hata – but he doesn’t consider those here at all). O’Donovan also hyphenates eclipsis (thus
a d-tiġ ‘in a house’), he even explicitly says “The eclipsing consonant is separated, in some modern books, from the radical one by a hyphen (…) the hyphen placed by the moderns between the
m and the
b is now preferable” – does this make
a dtiġ or
i dtiġ not authentic?
Then, a 100 years earlier, in 1728, Mac Curtin’s grammar writes those without a hyphen (and it also is a Modern Irish grammar, although heavily influenced by the bardic tradition and pretty archaizing in places).
(Of course, those early grammars often have lots of complete nonsense too, like O’Donovan claiming that in “ancient manuscripts” (but citing examples from not-that-ancient Keating too) eclipsis is put “merely for euphony, for no grammatical reason whatever” just because, it seems, he does not understand classical accusative or Old Irish neuter.)
Anyway, the point is, writing h-prefix without the hyphen was a common practice throughout the 19th century and the first half of the 20th century, even if opposed by PUL, and if O’Donovan, Ó Nualláin, and some others wrote the hyphen themselves. An Duinníneach was inconsistent, Eleanor Knott, when editing PUL with his approval, did not use the hyphen, neither generally did the typesetters of
Irisleabhar na Gaedhilge. So again, saying that writing h-prefix without the hyphen is not authentic for Gaelic type, or that it is a later post-Roman script thing, is just plainly not true. The hyphen was never a universally agreed-upon standardized convention.
Saying that “a few grammarians in the 19th and early 20th century considered writing it with the hyphen to be a better practice” could be true, but that’s not the claim you made.