20 INTRODUCTION. 



1. Oxygen ... ... 54,684 



2. Hydrogen ... ... 16,455 



3. Silicon ... ... 15,818 



4. Aluminium ... ... 4707 



5. Magnesium ... ... 1822 



6. Sodium ... ... 1735 



7. Iron ... ... 1588 



8. Calcium ... ... 1537 



9. Potassium ... ... 1001 



10. Carbon ... ... 324 



11. Titanium ... ... 110 



12. Chlorine ... ... 68 



13. Phosphorus ... ... 51 



14. Manganese ... ... 26 



15. Nitrogen ... ... 25 



16. Sulphur ... ... 23 



17. Fluorine ... ... 17 



18. Barium ... ... 4 



19. Chromium 4 



100,000 



The great changes in the order of hydrogen (from 9th to 

 2nd place), sodium (7th to 6th), iron (4th to 7th), and calcium 

 (5th to 8th) will be noted. The low position of nitrogen, 

 which is usually regarded as so abundant, in both tables is 

 also worthy of attention. It is hardly necessary to say that 

 the other elements are very much less abundant and have 

 been ignored in the compiling of the above tables. 



