SOi 



Proceedings of the Royal Irish Academy. 



Table of Data, Etc. 



Element. 



-Molecua 

 weight. 



Specific 

 gravity. 



Tempera- 

 ture. 



M 



s' 



Nature 

 of Molecule. 



Hydrogen, . . 



2 



0-06926 



0° 



28-800 



Diatomic. 



Nitrogen, 



28 



0-9713 



0° 



'29-430 



Diatomic. 



Oxygen, . . . 



32 



1-10563 



0° 



28-942 



Diatomic. 



Ozone, 



48 



1-658 



— 



28-950 



Triatomic. 



Sulphur, . . 



64 



2-2133 



980° 



28-916 



Diatomic. 



Sulphur, 



192 



6-62 



524° 



29-003 



Hexatomic. 



Chlorine, . . 



70 



2-500 



800° 



28-000 



Diatomic. 



Phosphorus, 



124 



4 4125 



750° 



28-101 



Tetratomic. 



Arsenic, . . 



300 



10-425 



656° 



28-786 



Tetratomic. 



Bromine, . . 



160 



5-46 



100° 



29-304 



Diatomic. 



Selenium, 



158 



5-68 



1400° 



27-816 



Diatomic. 



Tellurium, . . 



256 



9-08 



1400° 



28-193 



Diatomic. 



Iodine, . . . 



254 



8-72 



483° 



29-128 



Diatomic. 



Cadmium, . 



112 



3-94 



1000° 



28-419 



Monatomic. 



Zinc, . . . . 



65 



2-38 



1400° 



27-310 



Monatomic. 



Mercury, . . 



200 



6-9175 



688° 



28-912 



Monatomic. 



