CHAP. XIX. 



SOME GENERAL OBSERVATIONS ON THE ATO- 

 MIC WEIGHTS OF CHEMICAL BODIES. 



1. HYDROGEN is the lightest of all known 

 bodies. Its atomic weight is 0-125. 



2. The atomic weights of all the other simple 

 bodies are multiples of 0-25 = 2 atoms of hydro- 

 gen. Consequently, the number denoting the ato- > 

 mic weight of each is either a whole number, or 



a mixed number, ending with one or other of 

 these decimals : 0-25, 0*5, 0*75. 



3. The atomic weights of the supporters are 

 as follows : 



Oxygen 1 



Chlorine 4-5 

 Iodine 15-5 



They are all multiples of 0*5, or of 4 atoms of 

 hydrogen. 



k The atomic weights of the acidifiable com- Acidi 

 bustibles are as follows (omitting hydrogen) : M. "" 



1. Carbon . . 0-?5 



2. Boron . . 1 



3. Silicon . . 1 



4. Phosphorus 15 



5. Azote 1-75 



6. Sulphur 2 



7. Tellurium . 4 



8. Arsenic . 4-75 

 9- Selenium . 5 



