CXXxiv PROCEEDINGS-PERTHSHIRE SOCIETY OF NATURAL SCIENCE. 
Museum at Edinburgh: they belong to the very commencement of 
the Bronze Age and are therefore of a hoary antiquity. If we are 
right in supposing that Bronze reached our Island about 1000 B.C., 
the Letham Quarry Cist must have been erected several centuries 
before our era (See on the whole subject Evans’ “Ancient Bronze 
Implements of Great Britain.”) 
There is a local history of the discovery of “ stone coffins ” at 
various dates in the neighbourhood of Letham Quarry: the whole 
district is an interesting one archteologically: an ancient and striking 
Moot Hill lies by the roadside half-a-mile to the north-west—between 
which and the quarry “ coffins ” have been found—the Roman Road 
from Ardoch runs past the quarry to the south, and on the Hill of 
Ruthven to the west are two stone circles. On the occasion of my 
visit to the quarry, I went on to examine these circles. I had only 
time for a cursory examination, but I soon found that the northmost 
stone of the larger circle is elaborately cup-marked, the cups being 
surrounded by clearly defined rings. These circles have not been 
explored so far as I am aware; some of the stones had been blasted. 
The discovery of the Cist will be of great value if it leads to a 
systematic study of this district and to the preservation of any relics 
which it may contain. 
Colonel Campbell give a Report on the Photographic Excursions 
held duriug the summer of 1896. 
Mr. R. Kidston, F.G.S., Stirling, exhibited a series of Geological 
Photographs by means of the Limelight. These consisted of views 
illustrating geological structure around Stirling and in other parts of 
Scotland, and also photographs of Fossil Plants from the Coal 
Measures. 
Mr. Kidston also exhibited a new apparatus for enlarging and 
reducing, and explained its working. 
The President exhibited and explained a series of Limelight 
Views from Photographs by Mr. Arthur S. Reid, M.A., F.G.S., 
Trinity College, Glenalmond, illustrating chiefly the Physical 
Geology of the Glenalmond district. 
25th February, 1897. 
CONVERSAZIONE. 
(Jointly with the Students’ Union.) 
This Conversazione was held in the Society’s Rooms and the 
Working Boys and Girls’ Hall, and was well attended by the members 
of the Society and the Union, and their friends. 
In the Hall, a Lecture on “ Colour Photography and the Stereo- 
photochromoscope (Kromskop) ” was given by Mr. William Snodgrass, 
M.A., M.B., Senior Assistant in Physiology, Glasgow University. 
( 
