940 
cause of particularly intense noises of the war. For the naval battles 
the determinations of place often were vague enough, nevertheless 
the place indicated will not be far from the real one. We shall 
enumerate here the dates; 
October 7—9t. Bombardment of Antwerp. 
17th, Naval battle on the North Sea, ending in the 
destruction of 4 German torpedo-destroyers. 
a SE First bombarding of German positions at the Yser 
by English naval guns. 
. 22nd, Heavy fighting on the line Ostend—Nieuport— 
Ypres. 
7 24th, Heavy fighting at the Ysercanal (Y): the Germans 
force their way over the Yser. Severe fighting E. 
of Ypres (Y,) and S. of Lille. 
2 28th, Heavy English naval guns (12-inch) bombard 
heavy German artillery in Flanders. 
November 15. Severe attack of Germans on Ypres. English 
naval guns in action. Heavy fighting at Dix- 
muiden, on the Lys, and at Messines. 
January 24. Naval battle in the North Sea, ending in the 
sinking of the “Blücher”. 
In one of the figures (fig. 11) the supposed position of the English 
naval guns and the places mentioned in the above list are indicated 
by their initial letters; at the circles these same letters indicate 
their centre. 
$ 5. The silent region. 
The little chart for October Stk (October 7 and 9t" with fewer 
reports show exactly the same features) forms a very clear example 
of a silent region. Though there are a few reports in our country 
between the circles with 100 and 158 K.M. radius, these do 
not count against the numerous reports within the circle of 100 and 
without that with 158 K.M. radius. Especially remarkable is that 
at the very large distance of over 158 K.M. reporis appear again, 
which talk of vibrating window-panes ete. — a thing which never 
occurs in the silent region. 
Some observers reported that the sound arrived at a rather 
large angle with the horizon. 
The reports, collected quite independently by Mutnarpus, fall 
exactly into line with the Dutch ones. In the neighbourhood of 
Cleve a few reports fall within the circle of 158 K.M. radius, but 
we must take into account that these reports were not asked for 
