XXXli PROCEEDINGS—PERTHSHIRE SOCIETY OF NATURAL SCIENCE. 
Arrived at Glenfarg Station the party separated and “ homewards 
each took off his several way.” 
On Saturday, 16th June, a party of about sixteen ladies and 
gentlemen, members of the Society, proceeded from Perth by rail to 
Comrie. About midway between Crieff and the latter place we 
could see that the. whole side of Torlum Hill was covered with fallen 
trees, a striking instance of the great havoc caused in this district by 
the great storm of 17th November, 1893. From Comrie we drove up 
Glenartney along the right bank of the Ruchill. The road runs high 
above the river, which flows far below, almost invisible amidst the 
thick woods that clothe its banks—“Lone Glenartney’s hazel shade.” 
About five miles from Comrie is a pretty little waterfall, Sput-a- 
Chleibh, and to visit this we left our carriages and scrambled down 
the steep bank, here comparatively bare of wood. Some pleasant 
hours were spent here by those who were botanists or geologists, as 
well as by those who were neither the one nor the other. The 
botany proved no richer in June than we had found it the previous 
year in August. The geologists, on the other hand, found much to 
claim their attention. 
“ The picturesque little fall of Sput-a Chleibh has been caused by 
a trap dyke which intersects the course of the stream obliquely at 
this point. The trap rock (basalt) is rather harder than even the 
hard conglomerate (Old Red) through which it runs, and, resisting 
the denuding action of the water longer, has formed a barrier in its 
course. The portion of the dyke exposed in the bed of the stream 
exhibits very distinctly the prismatic structure common to all Tertiary 
dykes. A miniature dyke of conglomerate about a foot in width 
was seen standing up boldly at right angles to the trap dyke, caused 
probably by alteration of the conglomerate through contact with the 
molten volcanic material. A few yards further down the stream 
another dyke intersects its course, and unites with the main dyke a 
little further to the west. The main dyke may be traced in an 
almost continuous line eastwards as far as the summit of Moncreiffe 
Hill. It crosses the Edinburgh Road near Scoonieburn. 
“At Sput-a-Chleibh an interesting example was observed of the 
way in which trees frequently assist in the disintegration of rocks. 
An ash tree had established itself on a rocky prominence, and had 
sent its rootlets down through the joints and fissures of the rock. 
As the tree grew the roots also increased in size, making the fissures 
wider and exposing fresh surfaces to the action of the weather. At 
present the disjointed fragments of the rock are held together by the 
powerful roots which have curled round them, but when these at last 
decay the whole will crumble into fragments. Good photographs 
were obtained of this and of the dykes, which in due course will be 
exhibited in the geological cases of the Museum.” 
Leaving Sput-a-Cleibh we again took to our carriages, and, 
returning for some distance by the road we had come, we struck to 
the east and joined the road from Ardoch to Comrie at Blairinroar 
Toll. Near this we halted at a place called, on the map, “St. Patrick’s 
Well.” There is a small well here which issues from the base of a 
