16 



Mr. G. J. Stoney on the Physical 

 Table I. {continued). 



[Recess, 



Elements. 



Observed 

 vapour- 

 density, 

 that of air 

 being the 

 unit. 



Observed 

 vapour- 

 density, 

 that of 

 hydrogen 

 being the 

 unit. 



Presumed masses of 

 the gaseous mole- 

 cules, that of hy- 

 drogen being the 

 unit. 



Whether 

 present in the 

 sun's atmo- 

 sphere or not. 



Vanadium* 



Chromium 



Manganese 



Iron 



Cadmium 



Nickel 



Cobalt 



Phosphorus » 



Copper 



Yttrium 



Zinc 



Selenium 



Bromine 



Rubidium 



Strontium 



Zirconium 



Cerium 



Lanthanum 



Sulphur under 500° C 



Didymium 



Molybdenum 



Niobium 



Mercury 



Rhodium 



Ruthenium 



Palladium 



Silver 



Tin 



Thorinum 



Uranium 



Antimony 



Iodine 



Tellurium 



Ccesium 



Barium 



Tantalum .-. 



Arsenic 



Tungsten 



Gold 



Iridium 



Platinum . , 



Osmium 



Thallium 



Lead 



Bismuth 



3-94 



4-50 



o-bb 

 5-54 



6-617 



6-976 



8-716 

 8-913 



10-6 



56-94 

 65-03 



80-46 

 80-06 



95-62 



100-81 



125-95 

 128-80 



153-18 



51 -2 which 



isV 





52-5 



" 



Cr 



present, 



55 





Mn 



present. 



56 





Fe 



present. 



56 







not. 



59 





m 



present. 



59 





Co 



present. 



62 





2P 





63-5 



Cu 



present. 



64-36 





Y 



65 





Zn 



present. 



79-5 

 80 





Se 

 Br 



85-4 





Eb 



not. 



87-5 





Sr 



doubtful. 



89-5 





Zr 





92 





Ce 



not. 



92 





La 



not, 



96 





3.S 





96 





Di 



not. 



96 



Mo 





97 





m 





100 







not. 



104-2 





Eo 





104-2 





Eu 



not. 



106-5 





Pd 



not, 



108 





Ag 



not. 



118 





Sn 



not. 



119 





Th 





120 





U 





122 



>J 



Sb 



not. 



127 



J> 



I 





129 



JJ 



Te 





133 





Cs 





137 





Ba 



present. 



137-6 



)} 



Ta 



150 



JJ 



2.As 





184 



>5 



W 





196-6 



5> 



Au 



not. 



197-2 



Ir 



not. 



197-2 





Pt 



not. 



199 



J> 



Os 





204 



)> 



Tl 





207 



>) 



Pb 



not. 



210 





Bi 





* [The position of vanadium has been altered from that assigned to it in the MS. of 

 this memoir, in accordance with Eoscoe's recent investigations regarding this sub- 

 stance. If the vapour-density of vanadium be ever determined, it is presumable that 

 its molecular mass will prove to be 2 V, i. e. 102-4, in analogy to those of phosphorus 

 and arsenic, in which case its position in the Table will need to be altered again. — Sep- 

 tember 1868.] 



