

DR JOHN MURRAY AND MR ROBERT IRVINE ON THE 



absent from the deep-sea samples, but abundant in those from the Clyde area. The 

 manganese is also more completely oxidised in the deep-sea samples.* 



* Partial Analyses of Several Clyde Nodules (Anderson). 



Manganese Oxide, MnO . . . 

 Peroxide Oxygen, . . . . 



Insoluble in Hydrochloric Acid 

 Formula of Peroxide .... 



Nodules from off Skate Island, Lower Loch l-'yne, 

 in 104 Fathoms. 



Nodules from off Paddy's 



Rocks, Upper Loch Fyne, in 



20 Fathoms. 



Nodules from off Skelmorlie 

 Bank, in 11 Fathoms. 



Percentage 



Composition. 



Composition after 

 Deducting Water. 



Composition after 

 Deducting Water 



and 

 Insoluble Matter. 



Per- 

 centage 



Com- 

 position. 



Composi- 

 tion after 



Deduct- 

 ing 



Water. 



Composi- 

 tion after 

 Deduct- 

 ing 

 Water 

 and 

 Insoluble 

 Matter. 



Per- 

 centage 



Com- 

 position. 



Composi- 

 tion after 



Deduct- 

 ing 



Water. 



Composi- 

 tion after 



Deduct- 

 ing 

 Water 

 and 

 Insoluble 

 Matter. 



Rinds. 

 24-830 



4-846 



21-410 

 40-040 



MnOj.gg 



Kernels. 



33-657 



7-096 



22-190 



28-870 



Mn0 1>9s 



Rinds. 

 39-294 



7-669 

 33-882 



Kernels. 

 44-367 



9 '354 

 29-251 



Rinds. 

 59-429 



11-599 



Kernels. 

 62-710 



13-221 



16-420 

 3-720 



7-117 



1-758 



14-930 



48-020 



MnO. 



30-151 

 6-831 



13-068 

 3-228 



27-415 



41-538 

 9-410 



18-004 

 4-447 



16-656 



3-366 



6-960 



1-890 



16-310 



43-890 



MnOj.gg 



28-543 

 5-768 



11-927 

 3-239 



27-950 



39-616 

 8-006 



16-554 

 4-495 



Partial Analysis of a Manganese coating on a stone from Loch Fyne (see Fig. 4). 



The substance was broken, and the Fine Particles separated from the Coarse by levigation, and dried in air. 



Manganese coating was divided into Fine Washings =63-03 per cent. 

 ,, ,, Coarse Particles «= 36 -97 ,, 



100-00 



Insoluble in Hydro- J 

 chloric Acid i 





Fine Washings. 



Coarse Particles. 



Percentage 

 Composition. 



Composition 



after Deducting 



Water. 



Percentage 

 Composition. 



Composition 



after Deducting 



Water. 



Water, H.,0 

 Manganese Dioxide, MnO., 

 Ferric Oxide, FC0O3 

 Alumina, Ai.,0 ;i 

 Silica, Si0 2 

 Ferric Oxide, F p :Ai 

 Alumina, A1 2 3 



Total Insoluble in Acid, 



12-615 

 57-930 

 3-220 

 1-120 

 9 000 

 trace 

 3-750 



(14-020 



66"293 

 3-685 

 1-282 



10-300 

 trace 

 1-291 



16-044 



17-434 

 58-560 

 1-960 

 0-910 

 6-810 

 trace 

 2-410 



10-040 



70-925 

 2-374 

 1-102 

 8-248 

 trace 

 2919 



12-160) 



The main difference between the two analyses is the larger cpjantity of iron and clayey matter present in the 

 Fine Washings, and a corresponding increase of manganese in the Coarse Particles. 



