110 REPORTS ON THE STATE OF SCIENCE.—1914, 
Armstronec, R. T. Coucats and E. H. Ropp. Proc. Roy, Soc., 
Series A, Vol. 90, pp. 111-173. 
VI. Parasulphonic derivatives of Chloro-, Bromo-, Todo, and Cyano- 
benzene. By C. 8. Mummery, B.Sc. 
VII. The Correlation of the Forms of Crystals with their Molecular 
Structure and Orientation in a Magnetic Field in the Case of Hydrated 
Sulphonates of Dyad Metals. By Henry EH. Armstrona and EK. H. 
Ropp. 
In the first of these it is shown that the method of treatment 
introduced by Barlow and Pope is applicable to a large number of 
derivatives of benzenesulphochloride or bromide of the formula 
C,H,R, . SO,Cl, R being an atom of halogen. When equivalence 
parameters are calculated from the axial ratios and the valency volume, 
in nearly thirty cases the values found of two of the parameters are 
all but identical with those of the corresponding parameters of benzene, 
the third parameter being increased by the same amount beyond the 
benzene value by the introduction of the sulphonic radicle. Hence 
it is to be supposed that the halogens have the same relative valency 
volume as hydrogen in all the compounds considered. Numerous 
other cases are quoted in support of the conception of valency introduced 
by Barlow and Pope. 
In the second communication data are given for various derivatives 
of benzenesulphochloride containing but one atom of halogen. It is 
shown fhat these fall into line with the di-derivatives. 
In the third attention is called to crystallographic peculiarities 
presented by substituted benzenesulphonates of dyad metals and a close 
relationship to corresponding toluenemephonates is established. The 
influence of water of crystallisation is considered. 
Attention is specially directed also to the peculiar behaviour of 
certain isomorphous salts of iron, cobalt and nickel in the magnetic 
field. When suspended similarly in either of two axial directions, 
corresponding isomorphous iron and cobalt salts always act along 
crystallographic axes at right angles to each other. Nickel salts 
behave like cobalt salts when suspended in the one axial direction, 
like iron salts when suspended in the other. Apparently the difference 
in the behaviour of the various salts is to be referred to magnetic 
peculiarities in the metallic atoms. 
Study of Solubility Phenomena.—Interim Report of the Com- 
mittee, consisting of Professor H. E. ARMSTRONG (Chairman), 
Dr. J. Varcas Eyre (Secretary), Dr. E. F. ARMSTRONG, 
Professor A. Finpnay, Dr. T. M. Lowry, and Professor 
‘W. J. POPE. Boxe 
Mucu of the time since the ein of this Committee has been 
devoted to setting up the required apparatus and getting it into working 
order in a new laboratory. Materials have been purified and work 
has been done to ascertain within what limits solubility determinations 
were trustworthy under the new conditions. 
