This paper has nothing to do with the Celtic, Roman, or Teutonic origins of the ancient field-systems of cultivation. Even if those controversies had not been decisively settled by air-photography and its latter-day discoveries, I possess no special competence for the task. I am here concerned with the form of the plots or fields themselves in which these cultivation-systems were carried on. And we possess abundant evidence that what are classed by competent investigators as ancient ‘ Celtic-fields ’—irrespective of whatever methods of cultivation or of crop-rotation prevailed within their borders—were quite frequently of the same irregular shapes as the later English fields ; of which countless numbers may still be seen.