Beiträge in geographischen Erforschung. ght liegen in der Tatsache, dass die glatte surfaceafforded keine Einreichung für Saatgut, die verteilten weitgehend durchdie terrific Stürme, die das Land fegen, über thesmoother Oberflächen durchgeführt werden und in Situationen besser adaptedto fangen Sie fallengelassen. * Dr. Shipley, in der sechsten Papier dieser Serie, Seiten 224-229, hat shownthat in einigen Gemeinden die Asche trägt so stark eine Konzentration von Eisen sulphateas der Pflanzen giftig zu sein. Aber das Auftreten solcher Einlagen wird zu veryspecial Situationen begrenzt. April, I ll.l] Bcoinnings der Rekultivierung 33.> SAMEN PL

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Contributions in geographical exploration . ght lie in the fact that its smooth surfaceafforded no lodgment for seeds which, distributed largely bythe terrific gales that sweep the country, are carried across thesmoother surfaces and dropped in situations better adaptedto catch them. *Dr. Shipley, in the sixth paper of this series, pages 224-229, has shownthat in a few localities the ash bears so strong a concentration of ferrous sulphateas to be toxic to plants. But the occurrence of such deposits is limited to veryspecial situations. April, I.ll.l] Bcoinnings of Revegetation 33.> SEEDS PLANTED IJV KU.MN(. WATER. To test this hypothesis and at the same time to ascertainwhether there was anything in the deposits which might preventgermination, buckwheat was sown in various habitats. Ateach planting the seeds were sown in two ways—by j^lacingthem in the ground and by scattering them on the surface ofthe ash. On our return to the Base Camp after the expeditionup the valley, it was found that the seeds plantcf] in the ground. ->•*«•* (- .*^ ^«%^^, >, * Photograph by Rohrrt F. Cnggs LUPINE SEEDLINGS SPREADLXG OUT INTO BARE ASH. Under the protection of the old vegetation along a dune ridge, they have starunl in deep ash beyond the ridge. When mature they will widen the .strip o( protecting vegetation and facilitate further the spread of vcgelatioo. Katmai beach, August, 1916. had in every case come u]) well and showed normal growth.which continued as long as we stayed. But of those scatteredon the surface of the ash not a single individual was found.Since the vicinity of the Base Camji abounds in birds, it wasthought that perhaps the seeds scattered on the surface mightall have been picked u]) by the birds, ami we awaited withinterest opportunity to examine similar jilanlings made atKatmai Village where there are no l)irds and hc wind sweep 536 The Ohio Journal of Science [Vol. XIX, No. 6, is greater. When examined, all of these with a single exception,

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• bookcentury1900
• bookdecade1920
• bookpublishercolum
• bookyear1920