ORDER I. GENERA AND SPECIES. 401 



CHARACTERS 



OF THE 



GENERA AND SPECIES 



OF THE 



ORDERS OF CLASS I. 

 I. ORDER. GAS. 



I. HYDROGEN-GAS. OdoUr. 



G. = 0-0001 ... 0-0014. 



1. PURE. Odour of hydrogen. 



G. = 0-00012. 



Pure Hydrogen-Gas. JAMESON. Vol. ii. p. 17. 



2. EMPYREUMATIC. Empyreumatic odour. 



G. = 0-0008. 



Empyreumatic Hydrogen-Gas. J. ii. 18. 



3. SULPHUROUS. Odour of putrid eggs. 



G. = 0-00135. 



Sulphuretted Hydrogen-Gas. J. ii. 19. 



4. PHOSPHOROUS. Odour of putrid fish. , 



G. unknown. 



Phosphuretted Hydrogen-Gas. J. ii. 10. 



II. ATMOSPHERIC-GAS. Without odour or sapidity. 



G. =0-001 ... 0-0015. 



VOL. I. 2 C 



