NARRATIVE OF THE CRUISE 311 



bottle of the series was lowered to four thousand meters. But 

 when it was brought up, it contained globigerina ooze, showing 

 that it had been on the bottom. A second sounding was made at 

 once, and confirmed the shoaling of twelve hundred meters in a 

 few miles. All through these regions such irregularities of sea- 

 floor had been noted, but seldom so striking as this. On this day 

 Tony our cabin-boy caught four bonitos which furnished fresh 

 fish dinners for everyone. 



Since Graham had joined the party, the chemical program had 

 been expanded to include determinations of silicates, phosphates, 

 oxygen, and hydrogen-ions at each station. With his help it was 



The Boat-harbor, Lagoon, Penrhyn Island 



The resident white man, Mr. Wilson, was washed ashore here in 1888, following the 

 wreck of the Derby Park; and has never left the island. 



possible to add a vertical haul of a silk-net from one hundred and 

 fifty meters, at each station, besides occasionally checking the 

 plankton-pump. The pump determined the number of organisms 

 floating in the water and to check its efficiency one filtered a known 

 volume of sea-water collected in a large bottle through a small 

 silk-net, and counted the marine plants and animals so captured. 

 On November 10, it was decided to heave to in the lee of Pen- 

 rhyn Island to get a good measurement of the force of gravity. 

 The apparatus had not proved a success on the open sea. This 

 short stop enabled us to collect biological specimens and diatoms 

 from the lagoon, and furnished a little recreation. This tiny atoll 

 lies about midway between the Marquesas and Samoa, and is 



