AN UNUSUAL FORM OF VOLCANIC EJECTA 455 



balls encountered in the wells at these towns fell into the sea 

 originally. 



Unless conditions peculiar to the tropics, such as high temper- 

 ature and, perhaps, excessive humidity, are essential factors in the 

 phenomena which have been described, it would appear that mud 

 balls should have been formed in the eruption cloud from Katmai 

 Volcano in Alaska and in the recent eruptions of Mount Lassen 

 in California. So far as I have observed, none of the published 

 accounts of the eruptions of these volcanoes have mentioned ejecta 

 of this character. 



