336 



Hans Pettersson 



intervention of Dr. Bigelow I obtained from the Harvard Museum of Comparative 

 Zoology three manganese nodules, raised out of great depths in the SE Pacific Ocean, 

 from Dr. Agassiz's expeditions with the Albatross. 



Measurements of the radium content of these nodules were started in 1944, soon 

 after they had arrived in Goteborg. However, due to pressure of other work in 

 connection with preparations for a Deep-Sea Expedition with the Swedish Albatross, 

 the values I found have not previously been published. As the results in some respects 

 extend those of my earlier publication I have found the occasion propitious for 

 publishing them here, expressing at the same time my sincere gratitude to Dr. Bigelow 

 for his generous help, not only in this connection but also in other matters, and for 

 the most valuable discussions it has been my privilege to have with him. 



NODULES FROM THE "ALBATROSS" PACIFIC CRUISES UNDER DR. AGASSIZ 



The nodules obtained were from three stations visited during the Third Expedition. 

 The following descriptions are quoted from J. Murray and G. V. Lee (1909, p. 144): 



Station 13. Lat. 09° 57' N, long. 137° 47' W, depth 2,690 fathoms. " At this station a large 

 quantity of nodules was dredged, one of which is figured in Dr. Alexander Agassiz's preliminary 

 report. . . . They average 4 to 6 inches in diameter, and are all irregularly spherical or irregularly 

 cubical, and never tend to form slabs. Their most conspicuous feature is the high degree of mam- 

 millated structure: the whole surface is covered with large protuberances, which may be as much 

 as one inch in diameter. Sometimes these protuberances may be compounds, that is, formed of 

 smaller ones, grafted the one on the other. On the one side of the nodule the mammillae have a 

 relatively smooth surface, on which rubbing will develop a shining lustre; on the other side the 

 mammillae are more dull, with a shagreen-like appearance." 



Station Albatross 13. Lat. N 9' 



Table I 

 57'. Long. W 137° 47'. Depth 4923 m 



