So he with diff_iculty_ and labour hard Moved on, with diff_iculty_ and labour he. (_ib._ II. 1021 f.) The sweep Of some precip_itous rivulet to_ the wave. (TENNYSON: _Enoch Arden._) The sound of many a heav_ily galloping_ hoof. (TENNYSON: _Geraint and Enid._) I wish that somewhere in the ruin'd folds,... Or the dry thickets, I could meet with her _The Abominable_, that uninvited came. (TENNYSON: _Œnone._) _Do you see_ this square old yellow book I toss _I' the air_, and catch again, and twirl about _By the crumpl_ed vellum covers; pure crude fact-- (BROWNING: _The Ring and the Book_, I.) That plant Shall never wave its tangles light_ly and soft_ly As a queen's languid and imperial arm. (BROWNING: _Paracelsus_, I.) A distinction should be made between these hypermetrical syllables which change the character of the foot from dissyllabic to trisyllabic, and syllables (in a sense hypermetrical) which are slurred or elided in the reading. The word _radiance_, for example, is regarded as trisyllabic in prose, but in the verse-- "Girt with omnipotence, with radiance crowned," it is made dissyllabic by instinctive compression, and in no proper sense makes an anapest of the fifth foot. Of the same character are the numerous cases where a vowel is elided before another vowel--especially the vowel of the article _the_.[7] On the elisions of Milton's verse, see Mr. Robert Bridges's _Milton's Prosody_; on those of Shakspere's verse, see Abbott's _Shakespearian Grammar_. In modern verse the use of elision and slurring is ordinarily that found in common speech. _Omitted syllable (substituted iambus)._ As a vision of heaven from the hollows of ocean, that none but a god _might see_, _Rose out_ of the silence _of things unknown_ of a presence, a form, _a might_, And we heard as a prophet that hears _God's mes_sage against him, and may _not flee_. (SWINBURNE: _Death of Richard Wagner._) See also specimens on pp. 42, 43, 48, above. Mr. Mayor considers the question as to how far substitution of other than the typical foot may be carried in a verse, without destroying the genuineness of the fundamental rhythm. His conclusions are these: (1) The limit of trochaic substitution is three feet out of five, with the final foot iambic; or two out of five, if the fifth foot is inverted. (2) A spondee is allowable in any position; the limit is four out of five, with either the fourth or fifth foot remaining iambic. (3) A pyrrhic may occur in any position; the limit is three out of five, with the other feet preferably spondees. (4) The limit for trisyllabic substitution is three out of five. (_Chapters on English Metre_, chap. V.)