"In the first person simply _shall_ foretells;
In _will_ a threat or else a promise dwells:
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_Shall_ in the second and the third does threat;
_Will_ simply then foretells the coming feat."
(See T. K. Arnold's _Eng. Gram. for Classical Schools_, 3rd edit., p. 41.;
Mitford, _Harmony of Language_; and note 5. in Rev. R. Twopeny's
_Dissertations on the Old and New Testament_.)
The inconsistency in the use of _shall_ and _will_ is best explained by a
doctrine of Mr. Hare's (J. C. H.), the _usus ethicus_ of the future. (See
_Cambridge Philological Museum_, vol. ii. p. 203., where the subject is
mentioned incidentally, and in illustration; and Latham's _English
Language_, 2nd edit., p. 498., where Mr. Hare's hypothesis is given at
length. Indeed, from Latham and T. K. Arnold my Note has been framed.)