60 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 54 



Reducing this with the critical constants determined by Guye, CPl4 = 

 16.03-i,±.0022. 



Hence 



C = 12.0028, ±.0022 



Combining this with the value from methyl oxide, the weighted mean 



becomes 



= 11.9937, ± .00091 



From the oxide ratios C = 12. 0007, ±.0003. The two values combined 

 give C'= 12.0000, ±.00029. 



In this combination the actual variation from the whole number 12 

 is only 4 in the sixth decimal place ; a variation quite without significance. 

 Later, in the discussion of all the fundamental ratios, the value for carbon 

 is modified by other values derived from silver compounds; but the 

 change is not very large. 



From the density of toluene, Leduc ^ has recently deduced the value 

 12.003, which is notably higher than that computed here. The deter- 

 mination, however, is not sufficiently explicit in detail to admit of its 

 use for present purposes. Another value is calculable from Parson's 

 glucinum ratios;^ namely, C = 12.007. 



Addenda. The determinations by Baume and Perrot' of the density 

 of ethane appeared too late for use in the general discussion of the funda- 

 mental ratios. Two series of measurements were made, giving the sub- 

 joined figures for the weight of the normal litre : 



/. II. 



1.35671 1.35600 



1.35679 1.35610 



1.35671 1.35653 



1.35652 1.35640 



1.35700 1.35590 



1.35640 1.35640 



Mean of all as one series, 1.356455, ±.000065. Reducing their data 

 by means of the critical constants, the authors find 0,118 = 30.119, and 

 C = 12.036. This value is evidently too higli. 



There is also a preliminary note, by Scott,* which gives, without de- 

 tails, the results of combustions of naphthalene and cinnamic acid. In 

 six analyses, 17.6175 grammes of naphthalene gave 60.5355 of COj. 



1 Compt. Rend., 148, 832. 1909. 

 ' See section on glucinum, later. 

 ' .Tourn. Chim. Phys., 7, 369. 1909. 

 * Proc. Chem. Soc, 25, 310. 



