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Originally Posted by
Taranis
I agree that it would be with a *d if the borrowing occured after Grimm's Law was effective, but this is exactly what I'm arguing: Celtic loanwords were largely borrowed before the sound shift of Grimm's Law occured and as a result shifted accordingly.
If two words show the regular sound changes of their respective language family, then the words are inherited from the same source (IE or not) and are in no case considered as loanwords. Considering that words having undergone Grimm's Law can be originally Celtic appears to me as very speculative, and in any case imposible to demonstrate.

Originally Posted by
Taranis
It actually does. You have examples like Gaulish "Biturīges" or "Rigomagus", or Old Irish "ríge" (rule, kingship) versus Dutch "rijk", Swedish "rike", German "Reich". You have an evolution from Celtic *rīgjo- > Proto-Germanic *rīkja-
Yes, *rigjo-, but here we have -rix, and the attested gaulish ending is indeed -rix or -riks (see Delamarre's Dictionary of Gaulish).

Originally Posted by
Taranis
My point is that you can establish a relative chronology:
1) Sound changes from Proto-Indo-European to Proto-Germanic (other than Grimm's Law and Verner's Law, for example the dissolution of the syllabic resonants)
2) Celtic and Iranic borrowings into Proto-Germanic
3) Grimm's Law and Verner's Law (I'm personally a fence-sitter on the chronology of these two :) )
Indeed you are :)

Originally Posted by
Taranis
I might say, I do agree with Euler's concept of the "Germanic parent language" (or "Pre-Proto-Germanic" or "Proto-Germanic before Grimm's Law"), but I disagree with Euler on the timing of the language: in my humble opinion his "Pre-Proto-Germanic" is an accurate description of the language that would have been spoken earlier, during the Bronze Age (and perhaps start of the iron age).
Ringe challenges this pre-protoGmc hypothesis and assumes that the sound change may as well have occurred directly, without any internal steps - and this is actually what I think because this is what you can observe in vivo with actual languages.

Originally Posted by
Taranis
Is it really a common etymon if it is subject to regular sound laws from Proto-Indo-European to Celtic (e.g. *ē > *ī) or from Proto-Indo-European to Indo-Iranic (e.g. merger *l > *r). I think not.
Either the two cognates have undergone the sound changes specific to their own language family and they have inherited from a common source, either they have undergone the sound changes specific to only one of their language family, and there is a borrowing. I cannot see any other way.

Originally Posted by
Taranis
The problem is, again, the timing. I'm saying that Grimm's Law (and Verner's Law) did not occur from Proto-Indo-European to Proto-Germanic (where I would perfectly expect the substrate scenario you describe above, let me be very clear about that), but considerably later.
The timing, however, has a two main flaws :
1- we are not sure that the Celts are connected exclusively to the Hallstatt Culture and as a consequence we don't really know when the two people came into contact.
2- it is methodologically impossible to demonstrate your postulate, ie. that the Germans have borrowed words from the Celts before Grimm's Law.
and, I should add that we have a significant stock of germano-celtic words, ie. not borrowed from each other, which have no IE etymology, and which seem to testify the existence of a common substratum (I said "a" not "the" substratum, there was certainly more than one).

Originally Posted by
Taranis
I'm suggesting that this - most sound changes perhaps - must be internally driven (inside the language itself, or more accurately, from its speakers - lets not forget that languages are always about people who speak them. :) ) and not primarily substrate- or adstrate-driven.
This is the structuralist mechanistic answer :) and precisely the one which neglects the human factor. I am not claiming that I have made a new discovery with this substratum hypothesis, it is in fact very old - probably as old as the IE theory itself. Lately, a series of PIE dictionaries (Leiden/Brill) were published, which emphasized the influence of the substratum. This is especially true for the Germanic and the Celtic ones (not so much for the Latin which is very conservative and unimaginative IMO).