A JACK IN 



An Account of the Strange 

 Wonderful Isla 



By Captain F. M. Monger, 



THE following relating to recent 

 changes that have taken place in 

 the Bogoslof volcano of the 

 Aleutian Islands, Alaska, and the accom- 

 panying photographs, may be of interest 

 to the readers of the National Geo- 

 graphic Magazine:: 



I. Bogoslof volcano was discovered 

 about 1790 by the Russian admiral of 



BOGOSLOE ISLAND IN SEPTEMBER, 1908 



that name ; it was then but one island, 

 now called Castle Island. 



2. During the winter of 1886-87 a new 

 island appeared two and one-half miles 

 west - northwest from Castle Island, 

 which was named Fire Island. A nar- 

 row neck of land connected these two 

 islands, but a gradual subsidence took 

 place, and by 1900 there was a passage 

 between the two with not less than seven 

 fathoms of water. These islands are 

 probably thrown up from a deep-sea 

 volcano, as they come from great depths, 

 the 1,000-fathom curve being less than 

 four miles to the northwest. 



THE BOX 



Performances of the Most 

 d in the World 



en 1 or Captain U. S. R. C. S. 



3. During the winter of 1905-06 there 

 appeared a new peak about half way 

 between the old islands. When this peak 

 developed it formed connection with 

 Fire Island and left a passage between 

 it and Castle Rock in which the least 

 depth of water was five fathoms. This 

 peak was surveyed by officers from the 

 United States revenue cutter Perry, in 

 June, 1906, and was named Perry Peak 

 (see page 195). 



4. During the winter of 1906-07 

 another peak appeared, absorbing in its 

 uplift about half of Perry Peak, and fill- 

 ing in the space to Castle Rock, thus 

 making one island of the group. 



5. July 4, 1907, officers from the 

 United States revenue cutter McCulloch 

 made a survey of this peak and named 

 it McCulloch Peak. This peak was 2,000 

 feet through its base and 495 feet high 

 (see page 196). 



6. October 15, 1907, the McCulloch 

 again visited the island and found 

 McCulloch Peak had disappeared, and 

 where it stood a large harbor had 

 formed, with outlet to the sea near Cas- 

 tle Rock. 



7. It is thought this peak exploded 

 September 1. 1907, as on that date, at 

 5 p. m., a dense black cloud passed over 

 Unalaska Island, covering the land with 

 ashes, falling to a depth of three-six- 

 teenths of an inch on the board walks 

 in Iliuliuk, sixty miles from Bogoslof. 



8. July, 1908, officers from the United 

 States revenue cutter Rush made a 

 survey of the island and found great 

 changes. Perry Peak had disappeared ; 

 a high ridge of land extended from Fire 

 Island to Castle Rock, having an eleva- 

 tion of about three hundred feet at the 

 highest point ; the entrance to the harbor 

 near Castle Rock had filled in, high land 

 formed to the west, and an entrance 

 opened to the west-northwest, near Fire 

 Island. 



