2 adjectives to describe explanatory

If we are to judge it fairly, it must be simply as a provisional working-hypothesis explanatory of certain observations, and apart from all other psychological theories with which it may seem in conflict.

In an other late grammar,a shameful work, because it is in great measure a tissue of petty larcenies from my Institutes, with alterations for the worse,I find the following absurd "Note," or Rule: "An infinitive or participle is often followed by a substantive explanatory of an indefinite person or thing.

2 adjectives to describe  explanatory