12.07.11 What I've missed by staying dry on rainy days! Today I discovered that not only White Pine collect bubble masses at their base; Black birch and Maples do, too. The Black birch won the prize today for the biggest pile. Today's sample was many fewer trees, but a much higher percentage of mature pines had at least a bit of foam; only one Black birch; and two maples each had small bits of foam (by comparison).