3 mi. W Paulina Lake (cont.) June 20, 1937 - Comment of a general nature concerning the whole trip, now seems in order! Life Zones have been applicable to both plants and animals - but the limitations of this application have been obvious. Certainly if the markers of Life Zones have [illegible] very carefully chosen (because they include most of the forms to which the zones can be applied), then the system loses much of its value. However, though many birds (flickers, Red-tailed Hawks, vultures, Brewer's Blackbirds, Rosyites) and plants (Artemisia etc.) and mammals (porcupine, coyote,) show a range of two or more life zones, they are offset by a larger proportion of forms which do conform fairly well to Life Zones. But though this system is thus justified, I think that a combination with a system of floral-habitats might be to good advantage. The general abundance of birds during the trip, except in inhospitable regions, has been most heartening and testifies to an almost natural balance between the various species rare in more civilized country, predators, "game" birds etc.