From what has gone before we get the notion of true and perfect rhymes as opposed to false and imperfect ones. For two (or more) words to rhyme to each other, it is necessary
a. That the vowel be the same in both.
b. That the parts following the vowel be the same.
c. That the parts preceding the vowel be different.
Beyond this it is necessary that the syllables, to form a full and perfect rhyme, should be accented syllables. Sky and lie form good rhymes, but sky and merrily bad ones, and merrily and silly worse. Lines like the second and fourth of the following stanza are slightly exceptionable on this score: indeed, many readers sacrifice the accent in the word mérrily to the rhyme, and pronounce it merrilý.
The wítch she héld the haír in her hánd,
The réd flame blázed hígh;
And roúnd aboút the cáldron stoút,
They dánced right mérrilý.—Kirke White.
[§ 530]. In matters of rhyme the letter h counts as nothing. High and I, hair and air, are imperfect