xxx Contents 



PAGE 



Chart of the part of Loch Fyne in Scotland where 

 the nodules already described were found . . .166 



General bathymetric description of the sea-ward 

 part of the Firth of Clyde, with sections across Loch 

 Fyne. 



Description of the chart . . . . . .167 



On the charts of the British Admiralty the decimal 

 system of subdivision has always been used 1 . The 

 fundamental unit is the nautical mile and it is sub- 

 divided into ten cable-lengths, and each "cable" has a 

 length of 100 fathoms, whence the mile equals 1000 

 fathoms. Marine mensuration is thus made as simple 

 as possible, whether it be a question of lengths, areas or 

 volumes. This is put in evidence by the discussion in the 

 text of the dimensions of Loch Fyne where the dis- 

 covery of the nodules in shallow water was made. 



Sections of Loch Fyne described . . . 1 69 



Later visits to this part of Loch Fyne. 

 Physical description of the mud . . . .171 

 Description of the Plate illustrating the nodules 



collected in Loch Fyne ...... 173 



Details of analytical methods . . . . 1 74 



Tabular list of nodules analyzed . . . .178 



Tables of analytical results . . . . .179 



Tabular summaries of results . . . . 1 82 



Discussion of the tabular matter . . . .184 



The kernels of Loch Fyne nodules. 



General analysis of an average sample of Loch Fyne 



nodules .185 



Tabular results. 



Analysis of the mud in which the Loch Fyne nodules 



were found . .195 



Analysis of the Pecten shells found along with the 



nodules. 



General absence of quartz in abyssmal muds . . 196 



1 For the full discussion of this subject see the author's work, Comptes 

 Rendus of Observation and Reasoning, page 424. 



