COMPOSITION OF OCEANIC AND LITTORAL MANGANESE NODULES. 



471 



Table II. — Determination of Insoluble Residue. 



Number of 

 Sample. 



Weight 

 of Sam])le 



taken 

 (grammes). 



Weight of 



Insoluble 



Residue 



(grammes). 



Insoluble 

 Residue 

 per cent. 



Weight of 

 Insoluble 

 Residue 

 taken for 



Si0 2 

 Estimation. 



Weight of 



Si0 2 

 (grammes). 



Si0 2 per cent. 



In Insoluble 

 Residue. 



Equivalent 



in 



Nodules. 



a 



b 



c = 100- 

 a 



d 



e 



/= 10( 4 



d 



9 = ~J 



i 



1. 



II. 2. 



3. 



1. 



III. 2. 

 3. 



1. 



IV. 2. 

 3. 



V L 

 2. 



M \ 



* i. 

 i 



% 2. 



1: 



0-5290 

 0-4733 



0-4802 

 06001 

 0-5254 



0-5633 

 0-5839 

 0-5566 



0-5035 

 0-5248 

 0-4943 



0-5015 

 0-4825 



0-4977 

 0-5516 



0-5021 

 0-5321 



0-4639 

 0-4767 



0-5045 

 0-5110 



0-5814 

 0-5144 



0-1088 

 0-0961 



0-0815 

 0-1018 

 0-0894 



0-0937 

 0-0983 

 0-0937 



0-1386 

 0-1453 

 0-1358 



0-1001 

 0-0967 



0-1469 

 0-1646 



0-1395 

 0-1496 



0-1491 

 0-1535 



0-1463 

 0-1478 



0-1717 

 0-1503 



20-56 

 20-30 



16-96 

 16-95 

 17-01 



16-63 

 16-83 

 16-83 



27-52 

 27-68 

 27-63 



19-95 

 20-03 



29-51 

 29-83 



27-78 

 28-10 



32-13 

 32-17 



28-99 

 28-91 



29-56 

 29-21 



0-0958 

 0-1475 



0-1291 



01727 



0-1139 

 0-1631 

 0-1377 

 0-1458 

 0-1436 



0-0819 

 0-1278 



0-1127 



0-1442 



0-0961 

 1-1388 

 0-1161 

 0-1217 

 0-1208 



85-45 

 86-75 



87-26 



83-47 



84-34 

 85-10 

 84-28 

 83-44 

 82-70 



17-46 

 14-75 



14-68 



23-09 



16-86 

 25-24 

 23-55 

 26-83 

 23-94 



