Laws of Molecular Force. 7 



(M 2 /)*, and also the limiting volumes of the atoms, and 

 similarly with the other atoms and radicals involved in 

 Table IV. : for instance, in that Table Cl-I-H has a value 3'3, 

 whence that of 01 is 2*2 ; so in M/3 the volume of Cl + H is 

 23'5, so that the volume of CI is 19. In this way have 

 been derived from Table IV. the values now given in Table VI. 

 for the parts contributed to (M 2 Q* and M/3 by various atoms 

 and radicals, which after this will sometimes be denoted by 

 the symbols F and B : in the third row of numbers are given 

 the values of the ratio B/F. 



Table VI. 



01. Br. I. O. COO. S. N0 2 . 



B 19 245 31-5 5 20 17 24\5 



F 22 2-5 3*2 -5 1-8 16 2'8 



B/F 9 10 10 10 11 10 9 



N0 3 . CN. CNS. OH 2 . C 6 H 6 . NH 3 . H. 



B 32 19-5 37 17 755 20 45 



F 32 24 3-8 '9 66 31 M 



B/F 10 8 10 19 12 65 4 



For the first ten atoms and radicals the approach in the ratio 

 to constancy is close enough to show that F is nearly pro- 

 portional to B, or that attr acting-power in these atoms is 

 nearly proportional to the volume of the atom ; the mean 

 value of the ratio for the first ten is 10, of which the value 

 for CH 2 is nearly double, and that for the terminal H of 

 paraffins less than half; the value for NH 3 will be considered 

 presently along with those of some other compounds of 

 hydrogen. It would appear from the values for N0 2 , N0 3 , 

 CN, and CNS, that the value for N of F is 1-7, and of B is 

 about 15. 



It will be useful at this stage to consider the values of 

 (M 2 /)* and M/3 in those inorganic compounds for which they 

 are obtainable from table xxv. of the " Laws of Molecular 

 Force." 



Table VII. 



C0 2 . OS a . S0 2 . N 2 0. C 2 N 2 . HC1. H 2 S. 

 M/3 30 50 35 29 38 27 24 



(M 2 /)* 2-7 5-2 3-9 3-0 4-2 27 3-2 



Ratio 11 10 9 10 9 10 7 



H 2 0. NH 3 . PC1 3 . As01 3 . P0C1 3 . PSCL. P0C 2 H 5 C1. 

 Mj3 14 21 72 73 80 92 78 



{M. 2 lf 2-4 2-9 6-6 70 7'6 8'4 79 



Ratio 6 7 11 10 11 11 10 



CH01 3 . CC1 4 . O01 3 NO 2 . 2 C1 4 . Si01 4 . SnOL. 



M/3 72 80 86 87 92 101 



(M 2 0* 61 6-8 7-6 81 6-9 7'8 



Ratio 12 12 11 11 13 13 



