When he thinks of the comfort just described, this prompts him to also think of, or form a picture of, the summer evening etc. I'm not sure about "I". Perhaps it was a style favoured at that time or a quirk of the author.
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park sang joonThen I was wondering if "of a summer evening, the boys at play in the churchyard, and I sitting on my bed, reading as if for life" modifies "the picture."Yes.