Biological Papers. 247 



ment. Gulls and Baird cormorants and scattering pairs of block 

 oyster-catchers also inhabit the other islands of this group. 



Round islet is a rounded mass of rock about 100 feet in height. 

 It is off shore to the southwest about three-fourths of a mile from 

 To-leak Point, longitude 124° 34' west, latitude 47° 49' 40" north. 

 It is domed at top and is covered with a dense vegetation of brush 

 and coarse grass. It aggregates probably an acre in area. 



Alexander island has a ten-acre top. It is off shore about two 

 miles, in longitude 124° 30' 30" west, latitude 47° 47' 40" north. It 

 is roofed with a conglomerate series, which in the interior-conti- 

 nental region seems to be the dividing line between the Miocene 

 and the Pliocene formations. It is topped with green upon a thick 

 turf ; grass, brush and dwarf spruce trees abound on it. In height 

 it exceeds 110 feet. It has a sloping approach on the south, is 

 perpendicularly walled on the north, and has a deep embayment 

 on the south, being steep-sided on this side also. 



North Rock is off shore about two miles, in longitude 124° 29' 

 50" west, latitude 47° 44' 45" north. It is a picturesque island, 

 whitened by long use as a bird rookery. It is 90 feet in height, 

 100 feet in breadth, and about 50 feet in thickness. It is barren 

 of soil and is unclimbable. 



Destruction island is off shore from the mouth of the Hoh river 

 about three and one-half miles, in longitude 124° 30' west, latitude 

 47° 40' 20" north. The island proper covers about sixty acres; but 

 its total area, including reefs at low tide, aggregates a little over a 

 half a square mile in area. This island is covered over with a dense 

 cap of Pleistocene deposits; gravel (and semi-conglomerate rock), 

 clay, loam (composed in part of guano), in ascending series, the 

 whole resting upon upturned, eroded sandstone of Oligocene-Mio- 

 cene age. The reef areas are devoid of the Pleistocene cap, are 

 extensive in area, and stand out above the surf at ebb tide as ridges 

 and ribs of sculptured rock on all sides of the island. The island 

 proper is so densely covered with grass, salal and salmon-berry 

 bush and other low shrubbery that it is with difficulty that one is 

 able to get about from one part of the island to another. On this 

 island is located a government lighthouse and a life-saving station. 

 It is a delightful place on which to live for one who cares not to 

 have communication with the outside world but once in three 

 months, when the government "light ship" makes its regular in- 

 spection tour. This island has many species of birds inhabiting it. 



