Manchester Memoirs, Vol. xlvi. {igo2), No. 14. 3 



H/n. 

 Ne = I X H7= 7. 

 N = 2xH7= 14. 

 Ar = 3x H7= 21. 

 Kr= 6xH7= 42. 

 Xe= 9x H7= 63. 

 Si = 4xH7= 28 or 5 X H7 = 35.* 

 Fe = 8XH7- 56. Mn 55. Ni 58. Co 58. 

 Pd = 15 X H7= 105. Pel 105-6. Rh 104-4. Rii 104-4. Da. 

 Au = 28xH7=i96. Pt 197. Ir 198. Os 198. 



The definite multiple relations among the atomic 

 weights of the gaseous members of the series, indicate that 

 they were formed when their constituent parts had con- 

 siderable freedom of motion. In this respect the gaseous 

 series bears some resemblance to the triads of the alkaline 

 metals and other positive and negative forms of the series 

 Hn, H2n, which, at one period of their history, formed 

 part of the highly heated atmosphere of the terrestrial 

 globe. The resemblance of these several series to each 

 other is further seen in the characteristic spectra of the 

 triads of the new gases (including argon) to the homolo- 

 gous spectra of the triads of the alkaline and alkaline 

 earth metals. 



The characteristic inertness in the presence of reagents 

 of the series H/n, including iron under peculiar conditions, 

 is referred to in my paper on the origin of elementary 

 substances. It is also therein suggested that the members 

 of the iron, palladium and platinum groups of metals are, 

 respectively, allotropic varieties of each other, and that "it 

 is no objection to the theory that these metals cannot by 

 any known power of analysis be resolved into their 

 primaries, as the same objection would apply to the 



• Kegnault, Anna/es de Chimie et de Physique, Tome 63, pp. 24—31, 1861. 



