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III. On a New Law, analogous to those known under the names, 

 Law of Avogadro and Laiv of Dulong and Petit. By J. A. 



GROSHANSf. 



WHEN the boiling-points and densities of substances are 

 compared with their atomic composition, we find that 

 there is a law regulating this relationship which is analogous 

 to the laws mentioned in the title of this paper. 



I have called this law, The Law of " Density Numbers." 

 The density numbers (Densitatzahlen) form a new class of 

 constants, which present themselves as attributes of the ele- 

 ments, and are of the following nature. 



They are whole numbers. Each element possesses only 

 one, which may be easily determined ; but two or more 

 elements may possess the same number. 



Table I. contains a list of these new constants so far as they 

 have yet been determined. An asterisk affixed to a number 

 denotes that this is the number which appears to me probably 

 the correct one, but that verification is necessary. I venture 

 to hope that, when the scientific public realize the interesting 

 nature of this new law, the constants given in the Table will 

 be rigorously verified, and the gaps at present so numerous 

 will then be filled up. 



Table I. 

 Density-numbers of the Elements already determined. 



C 1 



Li 2 



B* 3 



P 4 



H 1 



Be 2 



K 3 



Na 4 



1 



S 2 



P 3 



Al 4 

 Si 4 

 CI 4 



Ms 5 



Ca 7 



y* 8 



Cr 9 



K 5 





As 8 



Mn 9 







Se 8 



Fe 9 







Br 9 



Ni 11 



Sr 13 



Zr* 14 



Co 11 



No* 13 



Sn 14 



Cu 11 



Sb 13 



Te 14 



Zn 11 





I 14 



Rb* 11 







Pd* 16 



Mo* 17 



Ba 19 



Ag 16 



Cs* 17 





Cd 16 







Ta* 23 



Hg 26 



W* 29 



Bi* 23 



Tl* 26 



Pt* 29 

 Pb 29 



t Communicated by the Author. 

 D.Sc, F.R.S.E. 



Translated by W. W. J. Nicol, M. A., 



C2 



