Gary Snyder has been a mosquito, and Jim Harrison would like to be a tree. These are two important things we learn from watching The Practice of the Wild, a documentary by John J. Healey featuring the old codgers (San Simeon/ Whole Earth Films, produced by Will Hearst and Jim Harrison, 52 min., DVD, $18.95). Although it contains some archival footage and short interviews with friends and colleagues, the bulk of the film consists of a Q&A between Snyder and Harrison. Officially, it’s Harrison asking the questions and Snyder answering them—however, in truth, it’s a shared conversation. It’s a delight to watch the two friends as they amble across the Santa Lucia Mountains discussing the objects of their passions: the earth and its poetry. They make a likable pair. Where Snyder is refined and eloquent, a trim graybeard speaking with the authority of someone accustomed to being listened to, Harrison is unassuming, earthy, and unkempt.