368 



liOGUSLUF VOLCANOES. 



ii rough sketch (fi<^. 1; originally published in Lutke's Atlas in 1836), 

 which, so fai" as I have been able to ascertain, is the first published 

 figure of the island; no others appear to have been drawn until 1873, 



Fig. ].— Tebenkol s sketch of Bogoslof and Ship Rock in IS'i'^. From the soutli. 



when Dall made six outline sketches from different positions. One of 

 these, from essentiall}^ the same point of view as Tebenkof's, is here 

 reproduced for comparison (fig, 2). It shows how the island had 



Dall's sketch of Bogoslof and Ship Rock in 1S73. From the south. 



shortened, and how the elevated central peak had weathered and dis- 

 integrated until it was hardlv higher than the northwest end, which 

 end had suffered most from the inroads of the sea. 



Kii;. :i.— (lid JJiigoslol' from west spit in ]^'J1. 



In 1887, according to Greenfield, the northwest peak was crowned 

 by a .slender pinnacle, which, in 1891, the date of my first visit, had 

 fallen. In the latter yeai- tliis peak was a huge, bluntly rounded pillar. 



