Contributions in geographical exploration . «?^ A DUiNE OF WIND-BLOWN ASH NEAR KODIAK. The rapidly shifting surface makes it impossible for plants to start.(Vegetation Station 59). QUICKSANDS IN THE SWAMPS. Quite a different set of conditions prevail in the numerousswamps, shallow ponds and tundras which were formerlycommon. Here also the deposit of ash has been increased bysecondary accumulations, in this case brought down by thestreams. There is no tendency for this ash to blow aboutfor it is kept constantly soaked. It is, moreover, of quite adifferent physical constitution from the loose sa
Contributions in geographical exploration . «?^ A DUiNE OF WIND-BLOWN ASH NEAR KODIAK. The rapidly shifting surface makes it impossible for plants to start.(Vegetation Station 59). QUICKSANDS IN THE SWAMPS. Quite a different set of conditions prevail in the numerousswamps, shallow ponds and tundras which were formerlycommon. Here also the deposit of ash has been increased bysecondary accumulations, in this case brought down by thestreams. There is no tendency for this ash to blow aboutfor it is kept constantly soaked. It is, moreover, of quite adifferent physical constitution from the loose sand of the should be explained that there was a marked differencein consistency between the three layers of ash as they fell. 40 lire Ohio Journal of Science [Vol. XIX, No. 1,. c; ts:;;^:; rr* S c ?i. ^ +- CQ C rt CQ ^^ H c ?*, .2 -5i y; ci3 ?<a. 0; 4J ^ r:: m 5^ T^ OJ o &> o 0^ ^^ O U) ^ 03 -4.:i O ^-^ s -^ ^M r^ ^ O O •- ^H ^?^ POND waterave CO c -^ K &.2 1— ^-^ n5 hJ o § T^ i:j W P-i W) o3 ffi S ?i IX! ^.-I^S < 2 +^ ^ S p Z t!^ ^/2 -< c ^^ Nov., Il)l8j Recovery of Vegetation at Kodiak 41 The bottom (^^ray) layer was made up of fairly large particles,giving the deposit the character of fine sand; the second (terracotta) layer was very much finer, almost all dust; while the toplayer (gray) was similar to the first but very much finer. Thetop layer has almost everywhere blown away, leaving the jjresentsurface of the ash composed usually of the middle Ijrown of the fineness and angularity of the i:)articles, thephysical properties of this layer are very peculiar. When dry,it is all blown away in a cloud of dust by the gentlest
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