178 
Proceedings of the Royal Society 
Walls and Sandsting.” (Rev. James Russell, Parliamentary 
Schoolmaster, Happyhousel, Walls.) 
Statistical Account of Foula states that “ Poula is com- 
posed of old red sandstone, with subordinate deposits of granite, 
gneiss, and mica slate. (Yol. xv. p. 20.) 
Lunna . — Stones of Stoffus. Mr Irvine, schoolmaster, called on 
Professor Nicol, Aberdeen, and showed to him specimen 
broken from stones. It is ordinary grey gneiss, quite like 
common rock of the islands. He alluded to doubt whether 
‘‘stones” transported. Professor Nicol inferred from Mr 
Irvine’s account they had been transported. There is no 
higher ground near them, and they form a landmark from 
the sea. They are from 20 to 22 feet high, and 90 feet 
round. Height above sea from 100 to 120 feet. 
Professor Nicol adds : — “ When in Shetland, I saw almost 
no indications of glacier action, except near the Grind of the 
Navir in the extreme west, where the rocks are distinctly 
striated and polished.” 
Explanation of Lithographic Sketches of Boulders. 
I. “ Tom Riach .” (See page 158.) 
II. “ Souter’s Stone." (See page 149.) 
III. “ Samson's Tutting Stone." (See page 168.) This boulder is near top 
of hill, as shown on Sketch. The other and smaller boulder below 
it, on hill side, is also shown on Sketch. The shape of each is 
indicated on a larger scale in the Sketch. 
IY. “ Flitchity Valley." Boulders near to top of hill, as shown on Sketch. 
The shape of one, and its precarious position, shown to right of 
Sketch on a larger scale. (See page 160.) 
Y. “ Clach na Cailleach" Boulder, or “ Old Wife’s Stone.” (See page 166.) 
VI. Boulder on Treshlik Hill. (See page 161.) Sketch shows position 
of boulder near top of hill. There is also an enlarged view, to 
show shape of boulder, and its precarious site. 
VII. Boulder on Dun Ii, Iona. (See page 156.) 
VIII. Auldearn. This Sketch in the dark shaded part shows general shape 
of the conglomerate boulders mentioned on page 166. The faintly 
shaded part is intended to show what the original shape of boulder 
may have been. (See page 140.) 
IX. “ Geadh ” or “ Goose ” Boulder, Iona. (Page 155.) 
X. Boulder of mica slate, on top of a rocky knoll, at Craigie Barns, 
North of Dunkeld. Length, 7 feet; width, 5| feet; depth, 4 feet. 
The smooth and sharp end points N. by W. The smooth surface 
