Contents xxix 



PAGE 



well, lie in the channel north-east of the island of Rum, 

 where there is a sounding of 147 fathoms marked on the 

 Admiralty chart of that date. 



Physical analysis of a sample of the mud showed 

 30 per cent, of nodules ...... 160 



Average specific gravity of the nodules 2-46 . . 161 



Like the oceanic nodules those from Loch Fyne are 

 agglomerations of the local mud united by an ochreous 

 cement in which Manganese peroxide predominates. 



The Loch Fyne nodules differ from those found in 

 the ocean depths inasmuch as their kernels are softer 

 than their outer shells, the reverse being generally 

 found in the oceanic nodules. 



The abundance of nodules obtained from the depth 

 of 104 fathoms in Loch Fyne proved to be local . . 162 



Later experience in the "Mallard" showed that 

 Manganese ochre is very widely distributed among the 

 littoral deposits of Scotland, but it was found nowhere 

 in such abundance as in the deepest basin of Loch Fyne. 



9 Ox im COMPOSITION OF OCEANIC AND LITTORAL 

 NODULES. [From Trans. Roy. Soc. Edin. Vol. 



<vi. Part 2. 1891, p. 459] 163 



In this paper the results of analytical work on 

 -^anese nodules made at various dates are collected 

 and discussed. 



Samples I, II and III were from a very successful 

 dredging in the Antarctic Ocean, about 400 miles south- 



the coast of Australia. 



Data regarding the temperature, the density and the 

 gaseous contents of the water in which they were found. 



I description of the nodalee . . . 164 

 >ni^t tin-in were two ear-bones <.t whales and one 

 tooth. l><>th ( ovrrrd with tin- blarU r .11; 



also some fragments of gramtr. probably conveyed 1>\ 

 icebergs from tin- Ant Mtmmt. 



:nples IV and V were parts ot the -a mo nodule 

 ; fathom*, MI th- middle of 



165 



winch tlii-v were 



poorer in i oxygen than 



the \nt.n-. tic Ocean. 



C 2 



