GENERAL OBSERVATIONS. 459 



19. Cerium 6-25 



20. Cadmium . 7 

 2J. Palladium . 7 



22. Tin . 7'25 



23. Barium . 8*75 



24. Bismuth . 9 



25. Platinum . 12 



26. Lead . 13 



27. Silver . 13-75 



28. Mercury . 25 



29. Gold 25 



They are either whole numbers, or they termi- 

 nate in O&5 or 0-5 ; and very rarely in 0*75. 



1 1 are multiples of 8 atoms of hydrogen, 

 6 are multiples of 4 



12 are multiples of 2 



Only 3 of them end in O75 ; namely, indium, 

 barium, and silver. 



7. The simple combustibles (excluding hydro- 

 gen) amount to 44. Of these 



20 (or almost the half) are multiples of oxygen, and conse- 

 qently whole numbers. 



9 are multiples of 4 atoms of hydrogen, and consequently 

 terminate in 0'5. 



9 terminate in 0'25, being multiples of 2 atoms of hydrogen. 



6 terminate in 0-75, being likewise multiples of 2 atoms hy- 

 drogen. 



8. When an acidifiable combustible terminates 

 in 0*75, the acid, which it forms, does not act 

 with much energy ; but when an alkalifiable 

 combustible terminates in 0*75 the base formed 

 is usually energetic. How far this applies to 

 iridium is uncertain ; but it applies well both to 

 barytes and oxide of silver. 



16 



