334 Mr. R. H. M. Bosanquet on a 
The inferences as to these constants to be drawn from the 
numerous experiments now discussed are not so clear as they 
appeared to be from the two cases treated in the last paper. 
The first of the following Tables contains the constants from 
all the experiments that have been reduced, finishing with 
those obtained from Rowland’s Table I. 
The remaining Tables contain the detailed comparison of 
the theory with experiment in all the cases, except ring H, 
and J first soft state, which two were given in the last paper. 
The last column but one of the first Table gives the product 
of A, the reciprocal of ~,andaconstant. This quantity may 
be compared with the maximum observed value of wu in the 
last column. 
A has been spoken of as the molecular permeability for a 
certain unit. Regarding magnetism as a motion or displace- 
ment, whether dynamic or static, we may thus speak of A as 
a coeflicient of freedom within the molecule. 
= being the coefficient of the forces which tend to prevent 
the rotation of the molecule as a whole, we may speak of its 
reciprocal as a coefficient of freedom without the molecule. 
The last column but one may be therefore regarded as the 
product of coefficients of intra-molecular and extra-molecular 
freedom, and a constant. : 
This product (¢ x intra- x extra-molecular freedom) is a 
characteristic of a given approximate state of a given piece of 
metal. It runs generally with the maximum of yw; but is 
liable to be depressed with respect to w where 7 has high 
values, as in the first, second, and fourth entries. As between 
the hard steel and the iron, the product of the coefficients of 
freedom is proportional to the maximum permeability. 
The further general conclusions, so far as these data go, are 
as follows:— 
In soft steel the molecular forces are chiefly extra-molecular, 
the freedom intra-molecular. 
In hard steel the molecular forces are chiefly intra-molecular, 
the freedom extra-molecular. 
In soft iron the average intra-molecular freedom is much 
greater than in hard steel, the extra-molecular freedom about 
the same. 
In soft steel the extra-molecular freedom is much dimi- 
nished, the intra-molecular freedom is moderate or high. 
The distribution of the freedom between intra- and extra- 
molecular conditions depends minutely on the condition of 
the piece of iron or steel. 
