PLATE II A 



Fig. I. Nodules of earlandite, Ca3(CgH507)2.4H20, from the Weddell 

 Sea (' Scotia ', St. 417, 2580 m.). x 8. 



Fig. 2. Nodules of earlandite attached by siliceous cement to the wall 

 of Rhabdammina linearis, Brady, x 14. 



Fig. 3. X-ray powder photograph of a nodule of earlandite, taken with 

 unfiltered copper radiation and with a cylindrical camera, diameter 

 6-04 cm. A length of 10 cm. on the original film is equal to 10 cm. on 

 the reproduced figure. 



Fig. 4. Portion of the spectrographic record from wave-lengths 4200- 

 6000 A. A quartz spectrograph fitted with a Hartmann diaphragm was 

 used giving accurately aligned spectra of: A, carbon arc alone; B, R.U. 

 powder; C, residue left after ignition of 4-075 mg. earlandite (see 

 Table III). R.U. (Raies Ultimes) powder consists of small quantities 

 of fifty-one elements diluted so that only the 'Raies Ultimes' (i.e. the 

 most important or sensitive lines) appear in the electric arc. 



