140 



GEOLOGICAL SURVEY OF THE TERRITORIES. 



Mr. Sloane took observations of two eruptions on August 9, as follows ; 



12.40 p. m. — Eruption commences. 



12.47 p. m.— Lull. 



12.49 p. m. — Maximum estimated at 25 feet. 



12.52.30. p. m. — Eruption ends. 



4.58 p. ni. — Eruption commences. 



5.04 p. m.— Lull. 



5.07 p. m. — Maximum estimated at 30 feet. 



5.11 p. m. — Eruption ended. 



The following- table gives the result of these observations : 



Average length of ernption 



Avei'a;;e interval between ernptions 4 



Average interval between commencement audlnll. 

 Average interval between Inll and maximum. 



The remainder of the springs at Mud Volcanoes I will give in a table, 

 as I did those of Crater Hills. 



Last year, when at this locality, we noticed that the trees near the 

 Giant's Caldron had their brances coated with mud, and the question 

 was raised as to how the mud got there, we concluded that the geyser 

 sometimes ejected its contents. This year, however, investigation 

 seemed to prove that the mud is carried uj) mechanically, mixed with 

 the steam that is constantly rising from the caldron, and that the spring 

 never has any eruptions. AVe were led to this opinion first by noticing 

 that it was only the under side of the branches that held the mud. Mr. 

 Holmes then placed some dead branches in such a position that the 

 steam came upon them and in a few hours they had a coating of mud. 

 Again, some of the trees on which the branches are coated are living, 

 which would hardly be the case had they received the mud from an erup- 

 tion. Another reason also is found in the fact that the surface of the 

 spring is constantly agitated, which is rarely or never the case with a 

 true geyser. Still in the past it may have been a geyser and had regular 

 eruptions. 



