The form _snid_ or _snith_ introduces the form _nid_ or _nith_, and suggests the enquiry whether that may not also be a word signifying water. Donaldson, (_Varronianus_), referring to a word Nethuns, "found on a Tuscan mirror over a figure manifestly intended for Neptune," observes that "there can be little doubt that _nethu_ means water in the Tuscan language." Assuming the correctness of the premises, I think that this must be the case; and that as the Naiades (water-nymphs), contain the Greek ναω; as Nereus (a water-god), contains the word _ner_ before referred to; as Neptune contains the Greek νίπτω, in each case involving the signification of water, so Nethuns (=Neptunus) must contain a related word _neth_ or _nethun_ of the same meaning. Also that this word comes in its place here, as a derivative of the root _nî_, and as a corresponding form to the Celtic _snidh_ or _snith_. There are, however, two other meanings which might intermix in the following names; the one is that suggested by Baxter, viz., Welsh _nyddu_, to turn or twist, in the sense of tortuousness; and the other is Old Norse _nidr_, fremor, strepitus. 1. _England._ The NIDD. Yorkshire. _Scotland._ The NITH. Dumfriesshire. _Wales._ The NEATH. Glamorgan. _France._ The NIED. Joins the Sarre. _Belgium._ The NETHE. Joins the Ruppel. _Germany._ NIDA, 8th cent., now the NIDDA. The NETHE. Joins the Weser. _Norway._ The NIDA. _Poland._ The NIDDA. _Greece._ NEDA ant., now the Buzi in Elis. 2. _With the ending en._ _Scotland._ The NETHAN. Lesmahago. 3. _With the ending rn (see note p. 34)._ _Germany._ NITORNE, 9th cent., now the NIDDER. There can hardly be a doubt that the words _sar_, _sor_, _sur_, so widely spread in the names of rivers, are to be traced to the Sansc. _sar_, _sri_, to move, to go, _sru_, to flow, whence _saras_, water, _sarit_, _srôta_, river. The Permic and two kindred dialects of the Finnic class have the simple form _sor_ or _sur_, a river, and the Gaelic and Irish have the derived form _sruth_, to flow, _sroth_, _sruth_, river. In the names Sorg, Sark, Sarco, I rather take the guttural to have accrued.