OLD BOGOSLOF 



297 



n 



figure of the island, and no others appear to have been 

 drawn until 1873, when Dall made six outline sketches 

 from different positions. 1 One of these, from essentially 

 the same point of view 

 as Tebenkof's, is re- 

 produced for direct 

 comparison (fig. 2). It 

 shows how the island 

 had shortened and how FIG ' 3> BOGOSLOF AND SHIP ROCK FROM THE 



SOUTHWEST IN 1873. AFTER DALL. 



the lofty central peak 



of Tebenkof (which in Langsdorf 's time, 1806, was still 

 higher and more precipitous) had weathered and disin- 

 tegrated until in 1873 it was but little higher than the 

 northwest end. This end the one facing Ship Rock 

 had suffered most from the inroads of the sea. The part 

 which in Tebenkof's sketch is capped by the first and 

 second pinnacles had been completely torn away, thereby 



FIG. 4. OLD BOGOSLOF FROM THE SOUTHWEST IN 1884. FROM PHOTOGRAPH 

 BY LT. G. H. DOTY OF THE ' CORWIN.' 



shortening the island by about a quarter of its length. 

 The ocean face of the northwest end, as seen in profile 

 from the southwest (fig. 3) had already become a perpen- 



1 Ball's sketches were made with unusual care, the proportions being corrected 

 by horizontal and vertical angles. They were published in Science of January 

 25, 1884. 



LIBRAI 



