Contributions in geographical exploration . interpreted as due to the breaking down of theconducting or root systems, which was in turn caused by mal-nutrition from the lack of leaves. In this is found the exi)lana-tion of the survival of saplings where large trees perished, asnoted above. The new leaves were able to keep the roots andbark of the sapling alive, but not sufficient to maintain the moreextensive roots and tops of the large trees. Thus many trees,comparatively but little injured in the eruption itself, have diedsubsequently because of inability to make good the destroyedbuds. 200
Contributions in geographical exploration . interpreted as due to the breaking down of theconducting or root systems, which was in turn caused by mal-nutrition from the lack of leaves. In this is found the exi)lana-tion of the survival of saplings where large trees perished, asnoted above. The new leaves were able to keep the roots andbark of the sapling alive, but not sufficient to maintain the moreextensive roots and tops of the large trees. Thus many trees,comparatively but little injured in the eruption itself, have diedsubsequently because of inability to make good the destroyedbuds. 200 The Ohio Journal of Scie?tce [Vol. XIX, No. 3, NEW ROOTS AT THE SURFACE OF THE ASH. Thosejplants like the willows, which readily put out newroots, were at a considerable advantage in recovering from theeruption, as compared with those without this power, like thepoplars. For such plants, by putting out new shoots at thesurface of the ash and new roots just beneath, could on the same basis as young plants without the necessity. Photograph by R. F. Griggs ^TUV^TC^^^u^^^^BW^^^^ ^RE BLIGHTING, BEGINNrlNGfATIHE TOP, BECAUSE OF STARVATION OF THE ROOT SYSTEM Jan., IDllJJ EjJects of the Eruption u)i Vegetation 201 of carrying the over-extended tops and roots of the old is very conspicuous in many places where the Alaskawillow {Salix alaxensis) grew among the poplars. In thecourse of three years the willow practically made good and was as thrifty as ever, while the poplars were moredead than alive. In places where the ash, after lying on the ground for sometime, has been washed away by streams, exposing the buriedparts of such trees, the difference between the willows andpoplars is very striking. The dead poplar trunks stand as theywTre at the time of the eruption, but the willows have grownextensive systems of new roots. These are not distributedthroughout the length of the buried stem but are almost con-fined to the region immediately beneath the for
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