( 643 ) 
At Mesch, at a depth of thirty three ells and at Bannet, near Mheer, 
at a depth of one hundred and nine ells, sand-stone and coal-slate 
are found. 
This considerable difference in level would be explained by 
fault VIII. 
From the information we have gained from STARING, two con- 
clusions may be drawn: In the first place, it will be advisable not 
to limit further researches in Limburg, to the tongue of Kohlscheid 
and its immediate surroundings, but to extend them to the other 
two tongues, especially to the one of Sippenaken. It is true there 
does not seem to be much chance of finding coal at the latitude on 
which Bommerig is situated but the very absence of productive 
carbon increases the chance of finding ore, whereas the seamlike 
construction and also the comparison with other spots add to the 
chance of there being more north, perhaps on a latitude with 
Valkenburg, a fresh synclinal fold, containing productive carbon. 
The tongue of Aubel, on the other hand is probably of less 
importance to us, since, on that latitude we are on Belgian territory. 
The second conclusion relates to a border-line, mentioned in the 
Report of the Royal-mining-Commission, instituted on April 17 1899. 
In this Report mention is made of “a probable border-line of 
the productive coal-beds”, a line which from Bocholtz bends to 
Valkenburg and from there runs north. As will be seen, that line 
touches the tongue of Sippenaken, and it is very well possible and 
according to my opinion even probable, that west of that line 
coal-beds will be found. 
The Hague, March 29% 1902. 
Chemistry. — ,Bromination and nitration in the aromatic series”. 
By Dr. J. J. BLANKSMA. (Communicated by Prof. LOBRY DE 
BRUYN). 
(Communicated in the meeting of March 29, 1902). 
In a previous article *) a few particulars were communicated on 
the bromination and nitration of some derivatives of phenol and 
aniline. Attention was then called to the fact that the nitration of 
aniline derivatives containing the group NH, presents difficulties 
1) Rep. Meeting 25 Jan. 1902. 
