Farts: A Fragment

Unfortunately this is all that I can reconstruct from Google Books' snippet view of the beginning of a poem by George Macbeth entitled "Farts," which appeared in Poetry Review 77 (1987) 35:

Farts! The last outrage of the bum
Whose lumpish contours, ordered to succumb
To forceful briefs or britches, feel their triumph come.

Farts! In their vengeful odour, still
They range as outlaws, pungent as pig-swill
And deafening the nose-drums like a noisome drill.

Lingering dregs! A dog's loosed knell
Which nothing but a good hosing can dispel
Or cat's thin, whiskery chink no disinfectant quell.

Worst is the human. Outcast air
That no disruptive perfume can repair
Or aerosoled excuses nullify or snare.