April, 1919] 



Beginnings of Revegetation 



337 



by someone who had walked across the area and pressed a 

 few seeds down into - the soil with his foot ! For neariy two 

 weeks after these seeds were planted, moreover, there had been 

 no hard blows, but considerable rain and mist, so that they may 

 be said to have had as favorable an opportunity for catching 

 hold as could have been given them under the climatic conditions 

 of the region. 



The same conditions are held responsible for the fringe of 

 seedlings found along the outwash deposited by temporary 

 streams. (See page 333). Seeds buried in the outwash 



MA^m^*'. 



Photograph by Jasper D. Sayre 

 THE SAME BEAR TRAIL A YEAR LATER. 



From a somewhat different position. The grasses in the track have made notable 

 growth, but no new plants have started in the general surface of the ash, 

 although the horsetail in the background, probably a survival, has consid- 

 erably extended its runners. 



deposits were protected from the wind and given favorable 

 conditions for germination in situations where none had caught 

 hold on the ground surface of the ash. Similar conditions, 

 but less striking, were found at Kodiak. (See the first paper 

 of this series, page 51). 



In 1917 further striking natural demonstration of the 

 inability of seeds to lodge in the general surface of the ash 

 was supplied by the discovery of several bear trails that had 

 "sprouted." The depressions made by the animal's tracks 

 in the soft mud had served to arrest numerous wind blown 



