Henderson on Ch'ing scholars

I don't know what more competent sinologists think about it, but I still find John B. Henderson's paper, «Ch'ing Scholars views of Western Astronomy», Harvard Journal of Asiatic Studies, 46 (1986) 121-148, quite good and most of all, quite useful. I read it recently while preparing some notes for the TWL and it was a very rewarding read. OK, here and there it needs updating, but it seems to me a very good summary. Am I missing something ? (very brief mention of TWL on p. 126. )