Contributions in geographical exploration . hat it can penetrate deposits up to about three feet in thickness. The horsetail is not, however, of anything like the importance in Kat- mai Valley that it is at Kodiak.* The deposits are for the most part so thick that it is only here and there that even the horse tail could grow through them. (See picture.). Second, thepatches of surviv-ing herbage serveas a wind breakin the shelter ofwhich new seed-lings can again is afunction of consid-erable importancelocally as will beseen from the dis-cussion to follow. Third, the oasesof resurrect
Contributions in geographical exploration . hat it can penetrate deposits up to about three feet in thickness. The horsetail is not, however, of anything like the importance in Kat- mai Valley that it is at Kodiak.* The deposits are for the most part so thick that it is only here and there that even the horse tail could grow through them. (See picture.). Second, thepatches of surviv-ing herbage serveas a wind breakin the shelter ofwhich new seed-lings can again is afunction of consid-erable importancelocally as will beseen from the dis-cussion to follow. Third, the oasesof resurrected veg-etation furnish theseed which may be the basis for starting new vegetation in thedesert round about. This, however, is not a factor of greatconsequence in this case. The plants have come back on thesteep mountains, from which the ash quickly slid off. so muchmore freely than in the deeply buried valley that they wouldfurnish abundant seed, even if nothing had survived on thefiats. Most of the plants of the district have seed adapted. Fliolo^raph by Robert F. Criggs Equisetum Coming Through the Botiom o? a Gllley where the Deposit was too Thick FOR it to *See the first paper of this scries, p. 13. 324 The Ohio Journal of Science [Vol. XIX, No. 6, for wind distribution, and the wind is so efficient a factorin this region, (see page 339), that seed in abundance istransported great distances. SEEDLINGS BEGINNING TO START. The seedHngs starting up to 1915 were so few% and occurredso sporadically, that in my report of operations that year I statedthat revegetation had not yet begun and that the observationsof that year could furnish no basis for a prediction as to whenit would begin, but a definite change was noticeable in 1916. / /.r //
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