The quote describes a humorous observation about the handwriting of students in a school, suggesting that their writing was remarkably similar. It paints a vivid picture of chaotic scribbles, likening it to the erratic movement of a fly that has gotten into an ink-pot, hinting at the messy and frantic nature of their writing.

This imagery emphasizes the shared struggle of the students with their penmanship, indicating that despite their differences, they all produced a legible but messy scrawl. Wodehouse cleverly uses this metaphor to illustrate a common experience among the schoolboys, uniting them in their lack of writing finesse.