Chemistry. — “The Ewistence of Hydrates in Aqueous Solutions”. 
By Prof. A. Smits, L. v. p. LANDE, and P. Bouman. (Communi- 
cated by Prof. P. ZEEMAN). 
(Communicated at the meeting of December 18, 1920). 
Since the research “On Retrogressive Melting-Point Lines”, in 
which an indirect proof was given for the presence of hydrated 
Na,SO, molecules in the aqueous solution, attemps have now and 
then be made to find other methods, which might be able to give 
an answer to the question whether formation of hydrates takes place 
in the aqueous solution, also in cases of melting-point lines with 
normal courses. 
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GRAMM FE‚CLgP100GR.OPL. — FeCl 
Fig. 1. 
1) Sirs, These Proc. Vol. 14 p. 170 (1911). 
