Looking at the biblio it would appear the article was written after Child had completed part 8 c1892 and whilst he was still working on the final 2 parts. The first couple of pages are a bit high-flown, vague and idealistic, but once he gets down to business there's some very useful info in there. Page 218 onwards is fascinating. There isn't a lot on the British ballads but for a European overview it's essential reading.