80 THE DEPTH AND MARINE DEPOSITS OF THE PACIFIC OCEAN. 
BOTTOM SAMPLES COLLECTED DURING THE THIRD EXPE- 
DITION OF DR. ALEXANDER AGASSIZ, 1899-1900. 
The bottom deposits collected by the “ Albatross” during her 1899-1900 
cruise were received at the Challenger Office shortly after the return of the 
expedition, and were examined by Sir John Murray, Mr. James Chumley, 
and Mr. Robert Dykes, Dr. Alexander Agassiz published some remarks on 
the bottom deposits by Sir John Murray in the preliminary report already 
cited. Most of the mineralogical determinations have recently been revised 
by Dr. G. W. Lee, who has also examined the manganese nodules collected 
during this cruise, which were not forwarded to the Challenger Office till 
some considerable time after the deposit-samples. Dr. W. A. Caspari has 
made a detailed study in the Challenger Office laboratory of the white pala- 
gonitic tuff from Station 2, and his results will be found in an appendix to 
this Report. 
The number of samples received from this cruise was 237, but, unfor- 
tunately, as many as 160 of these could not be fully described owing to the 
fact that in 97 cases the material had evidently been subjected to a certain 
amount of washing before reaching our hands, and in 53 other instances the 
amount of material available was too small to allow of a definite analysis 
being made. In 9 cases the material consisted of manganese nodules or 
rock fragments without any true deposit, and in one case the bottle in 
which the sample was contained was without any label or number, and the 
description of the material is, therefore, less important than it might other- 
wise have been. From these various causes the number of samples fully 
described in the following pages is reduced to 77. These are distributed 
in depth as follows : — 
Samples from less than 1000 fathoms . . - » . . - s/s. ses 7 
A Fe OU tO 2000, Poy es ee LO 
es «- 2000 to 3000  “ ee ee ee OU 
& « 3000 to 4000. * Cr eee a a 0) 
Me @ Over 4000 y ee Ep ee our a Re ak 
