In PE17:68 I find the description of the formation of participles:

"Simple past participle passive _kari-nwa_, adj. _-ina_, after vowel stems
_-nwa, sinwa, sîna_ 'known, certain, ascertained'. After intransitives
often = active participle, _va_nwa_. This has a past form _kárienwa_
(rare)."

As it is printed, 'this' seems to refer to the previously mentioned active
participle. However, given the style of Tolkien's notes, this may be an
accident and 'this' may in fact refer back to 'simple past participle
passive' at the beginning of the sentence. I wonder of anyone with access
to a copy of the original note could clarify if the text arrangement on
the original document can provide any clue as to what is meant here?

Thanks,

* Thorsten