194 
Silica, 
Protoxide of Iron, . 
65-51 , 
3-68 
Ratio of oxygen in 
Alumina, 
3-67 
1 the bases to that 
Soda, 
10-75 
in the silica as 
Potash, 
5*55 
3 to 11. 
Lime, 
10-42 
99-58 
The specimen of Dumfermline Abbey glass was too small to allow 
of any characters beyond the specific gravity and chemical composi- 
tion being ascertained. The specific gravity was found to be 2*63; 
chemical composition to be, — 
Ratio of the oxygen 
in the bases to 
that of the silicic 
acid as 3 to 4. 
Silica, 
44-47 
Protoxide of Iron, . 
4*98 
Alumina, 
12-21 
Lime, 
1723 
Magnesia, 
3-81 
Soda, 
13-90 
Potash, 
3-20 
99-80 
The third and fourth specimens examined were from Dunblane 
cathedral windows. 
They were of a blue colour, the first being the darker in tint, and 
were too small to admit of complete examination. 
The first sample had a specific gravity of 2-63, and consisted of. 
Silica, 
Protoxide of Iron, 
Alumina, 
Lime, 
Oxide Copper, 
Potash, 
Soda, 
62-70 
1-26 
2-60 
6-25 
4-99 
•80 
21-40 
Ratio of oxygen in 
bases to that of 
the silicic acid as 
3 to 10. 
100-00 
The second specimen had a specific gravity of 2-47 and chemical 
composition as follows : — 
Ratio of oxygen in 
bases to that of 
silicic acid as 3 
to 5. 
Silica, 
49 66 
Protoxide Iron, 
6-60 
Alumina, 
11-52 
Lime, 
19-25 
Oxide of Copper, 
1-32 
Potash, 
1-53 
Soda, 
10-09 
99*97 
