486 Proceedings of Royal Society of Edinburgh, [sess. 
The photograph of March 8 (fig. 5) shows a curious series of four 
sudden tilts to south, each followed by an equally sudden tilt to 
north, forming four of the saw-teeth I have referred to. Two days 
later there is a second set of three, very similar in character. 
In a third group of these records we might place a large number 
of irregular bends of the curve, which differ from the second group 
in being more gradual in their character. There is no appearance 
of any sudden effect having been produced on the mirror. 
The photograph of Oct. 20 (fig. 6) shows such a number of 
these irregular bends as to he almost bewildering. I find it stated 
in the Monthly Bulletin of the Geodynamic Department of the 
Observatory at Athens that a “ feeble shock” was experienced in 
part of Greece on this date. It is greatly to be regretted that the 
valuable assistance rendered to seismological research by the issue 
of this monthly publication is no longer to be reckoned upon. 
Notice has been received at the Observatory within the last few 
days that the publication of the list of earthquake records ob- 
served in Greece is to be discontinued, — as a result, I presume, of 
the unfortunate political troubles in which that country has been 
plunged. 
One more photograph (fig. 7), the last I have to call your atten- 
tion to, shows a number of curious bends, but whether they have 
any connection with a severe shock of earthquake which I find 
reported as having occurred in South Australia and Western Vic- 
toria on May 10, the date of the photograph, I am quite unable to 
say. 
The question may very naturally be asked — I might even say, 
the question has been asked — What place has such an instrument 
as this in an astronomical observatory? The Observatory at 
Blackford Hill has been established for the purpose of astronomical 
research as its first and most important object, hut it is also in- 
tended that physical researches having any bearing on astronomical 
questions may also he taken up as opportunities for doing so pre- 
sent themselves; and it is hoped that we shall he able to show 
hereafter that the work we have commenced with the bifilar 
pendulum has a very distinct connection with the meridian work 
of an astronomical observatory. In observing the declinations of 
stars, the fundamental index-point to which all measures are 
