and Littoral Manganese Nodules 185 



Fe 2 O 3 + A1 2 O 3 were determined, and we have the following 

 tabulated sumruiry: 



Sample K. Kernels of Loch Fyne Nodules. 



Carbonic acid 

 Moisture at 100 

 Available oxygen 

 MnO . . 

 Fe,O a + Al, O 8 

 CuO .. 

 NiO .. 



0-83 per cent. 

 8-23 

 6-26 

 37-15 

 4-78 

 trace 

 doubtful trace. 



The insoluble residue was not determined. 



In order to obtain some knowledge of the other constituents 

 of the Loch Fyne nodules, a number of nodules were pounded 

 up and mixed, so as to form an average sample in which the 

 determinations were to be made. They contained a certain 

 amount of soluble matter from the sea-water, and, if it had been 

 intended at first to make a complete analysis, the whole of this 

 sample would have been extracted at once. This was not 

 done, and the various portions, X, Y, and Z, have been treated 

 separately. Particulars follow. 



X. General Analysis. 



A sample of air-dried Loch Fyne nodules was thoroughly 

 extracted with boiling water. The weight taken was 5*0405 

 grammes, and the insoluble portion, when dried at 100, was 

 found to weigh 4-5458. 



A. Estimation of Moisture, o- 1910 of the sample was dried 

 )0, and found to lose o-ooio gramme, i.e., the percentage 



<>f water in it driven off at 100 is 0-53. 



B. Estimation of the Oxygen reducible by Hydrochloric Acid. 

 0-1195 griinni' were boiled with strong hydrochloric 



The chlorine liberated was passed into a solution of potassium 



Le, and the amount of iodine liberated found by titr.it inn 



with sodium hyposulphite. There was found to be 4-104 per 



..f available oxygen, representing 22-32 per cent, of MnO a . 



C. Estimation of Weight lost on Ignition. 0-1263 gramme 

 wen v heated over a Bunsen flame. The loss of weight 

 was found to be 0-0224 gramme; that Is, 1774 per rent 



