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POPULAR SCIENCE MONTHLY 



razed much that before had been upright, 'hot ashes were steaming at 

 the water's edge, and there were immense bowlders lying in a bed of 

 ashes.' These horizontal blasts are not hard to account for and do not 



Fig. 16. St. Vincent: The Fatal Windward Slope of the Soufriere. Leaving the horses 

 preparatory to the ascent. The mountains in the background in clouds. June 4, 1902. 



Fig. 17. St. Vincent: Ascent of the Windward Slope of the Soufriere, showing the 

 author and party, in a black fog, 2,700 feet up, the height of the western rim of the crater. An 

 anxious moment. The high rim was shortly after reached, 3,200 feet up (on the right). 



require a horizontal nozzle to project them. They are simply the re- 

 sult of the downblast after the heavy gravel has begun to fall, acting 

 against the upblast from the throat of the volcano, and both together 



