354 The Ohio Journal of Science [Vol. XX, No. 8, 



houses and tore up trees by the roots. The minimum velocity 

 of these winds was estimated by Mr. Y. Wada of the Imperial 

 Meterological Observatory at 40 meters per second, or 90 miles 

 per hour. 



From these quotations it is evident that while the disturbance 

 undoubtedly began with explosive phenomena, which were 

 probably an indispensable factor in setting the mass of rock in 

 motion, yet the behavior of the Slide, once started, was that of 

 the typical violent landslide like that of Elm or those of the 

 Katmai District. 



With the perspective furnished by these comparisons, we 

 are enabled to rank our landslides among similar phenomena 

 that have occured elsewhere. It is evident that they are con- 

 siderably larger than the best known landslides, but yet, if the 

 eruption of Bandai San be rightly grouped in this class of 

 phenomena, they must be counted pigmy affairs in comparison 

 with some landslides that have occurred. 



