1069. 
example of BierLow, for the elimination of the 11 year period the 
departures from the nearest 60 months (5 years) have been calcu- 
lated and not those from the normal of the whole period. 
Comparison teaches that in the beginning till 1891 the baro- 
metercurve shows indeed much conformity with the prominence curve; 
afterwards however every similarity has vanished and in the later 
years in which the prominences hardly show any variation, the 
barometeroscillation goes on with the same regularity as before. 
Therefore very likely the connection during the first years has been 
only accidental. 
Weltevreden, 10 October 1912. 
Chemistry. — “Dynamic researches concerning the reaction of 
FriepEL and Crarts.” By 5. C. J. Ontvirr and Prof. J. 
BOEsEKEN. (Communicated by Prof. A. F. HorLeMAN). 
(Communicated in the meeting of December 28, 1912). 
Dynamic researches have already been carried out with AICI, or 
analogous substances as catalyst. 
The first are those of A. Siator'), who investigated the action of 
chlorine on benzene in the presence of SnCl, and FeCl,. 
The absorption of the halogen dissolved in an excess of benzene 
was measured, and it was found that this proceeded according to 
the reaction scheme of the first order the constant being proportional 
to the amount of the catalyst. 
We may conclude therefrom that the catalyst is scan active 
that its action is not sensibly altered by any of the reaction ae 
Further we mention the research of B. D. Strrie*), whe has studied 
the ketone synthesis and the formation of phenyltolylmethane under 
the influence of AICI, and FCI, where the progressive change of 
the reaction was determined from the amount of hydrogen chloride 
evolved. 
1) Proc. 19, 135 (1903); Journ. Chem. Soc. 83, 729 (1903); Zeits. phys. Ch. 
45, 513 (1903). 
L. Bruner had carried out measurements as lo the bromination of benzene, 
but as a catalyst iodine was used which is not directly comparable with AICI, ; 
moreover it was not sufficiently taken into consideration that the bromine unites 
with the catalyst (see Dissertation S. C. J. OLIviER). 
Stator has also used iodine as catalyst. Although this research is very 
interesting as regards the benzene substitution, this part may be passed over for 
the reason stated. 
2) Journ. Chem. Soc. 83, 1470 (1903). 
