What is part three of kinnells poem vapor trail reflected in the frog pond about?

You're likely referring to the poem "Vapor Trail Reflected in the Frog Pond" by Bill Callahan, not Kinnell. There is no "Part Three" of this poem, as it's a single continuous piece.

However, the poem can be roughly divided into sections based on theme. Here's a breakdown:

* First Part (Stanza 1-10): Focuses on the speaker's observation of the vapor trail reflecting in the frog pond. This initial section evokes a sense of wonder and contemplation, considering the vastness of the universe and the fleeting nature of the reflection.

* Second Part (Stanza 11-22): Shifts to a more personal reflection on the speaker's own life and mortality. The vapor trail becomes a metaphor for the impermanence of existence, and the speaker grapples with the inevitability of death.

* Third Part (Stanza 23-32): Returns to the external world, focusing on the pond and its inhabitants. This section reflects on the interconnectedness of life, highlighting the cyclical nature of birth, death, and renewal.

While the poem doesn't explicitly break down into three distinct parts, these thematic sections create a cohesive and meaningful exploration of the relationship between the microcosm (the frog pond) and the macrocosm (the universe), and the speaker's own place within this larger picture.