In English we add to the radical syllable stag, the inflectional syllable s.
"The English Language"
Robert Gordon Latham
Hence a necessity of removing it from the radical, and placing it on an inflectional syllable.
"The English Language"
Robert Gordon Latham
In this difficulty, the only logical view that can be taken of the matter, is to consider the words himself and themselves, not as two words, but as a single word compounded; and even then, the compound will be of an irregular kind; inasmuch as the inflectional element -m, is dealt with as part and parcel of the root.
"The English Language"
Robert Gordon Latham