_ai_, _ei_ > _i_ cp. O. Ic. _stein_, O.N. _stæin_, O.Gtnc.
_stain_ = O. Dan. _stin_.
_io_, _iau_ > _u_ cp. O.N., O. Ic. _briote_, O.Gtnc.
_briauti_ = O. Dan. _biruti_.

Before 1000, _ē_ > _æ_ cp. O.N., O. Ic. _sér_ = O. Dan. _sær_
(written _sar_).
About 1,000, appears in O. Sw.--O. Dan. an excrescent _d_ between
_nn_ and _r_, e.g., _mantr_, pronounced _mandr_ (see Noreen,
p. 526).


7. OLD NORSE AND OLD DANISH.

Not until the year 1,000, or the beginning of the 11th Century, do
dialectal differentiations seem to be fully developed. O.N., which
in general preserves best the characteristics of the old Northern
speech, undergoes at this time a few changes that differentiate Dan.
and Norse still more. O. Sw. remains throughout closer to O. Dan. The
two together are therefore called East Scandinavian. Old Icelandic,
that is, Norse on Icelandic soil, develops its own forms, remaining,
however, in the main very similar to O.N. These two are then called
West Scandinavian. The following are some of the chief differences
between West and East Scandinavian at the time (from Noreen,
P.G.(2)I, 527):

1. _I_--(_R_) and _U_--_Umlaut_ in W.S. Absence of it in E.S.,
e.g.,

W.S. _hældr_ E.S. _halder_.