GEOLOGY OF BUTE. 329 



No. 4 is the altered limestoue from contact with the over- 

 lying trap at Ascog Mill; it is an impure, dark-coloured 

 rock, of an earthy aspect, and very like the trap which rests 

 upon it. 



No. 1. Spec. grav. 2-710. 



I 6-91 5-16 5-70 



J 



. 

 Alumina, 



Protoxide of iron, ................ 1-68 1-50 1'28 



Carbonate of lime, ............... 90-65 91-08 



Carbonate of magnesia, ......... 1-00 1-17 



No. 3. Spec. grav. 2-679. 



100-24 99-23 



No. 2. Spec. grav. 2-570. 



I. II. 



1 1-94 0-28 0-28 



Alumina, / 



Protoxide of iron, 0-52 0-56 



Carbonate of lime, 96-48 98-76 96-58 



Carbonate of magnesia, 1-23 2-24 



100-17 99-66 



Protoxide of iron, ............... 1-12 1-12 



Carbonate of lime, ............... 67'42 72-12 67-00 



Carbonate of magnesia, ......... 17'31 18-06 



Water, coalv matter, and ) 



Carbonic acid, ...... ! ...... } 4>45 4 ' 74 



100-00 100-00 



No. 4. 



Protoxide of iron, ............... 6-42 6-60 



Carbonate of lime, ............... 24-00 21-20 



Carbonate of magnesia, ......... 4-62 2'8o 



Water and carbonic acid, ...... 1 -75 4-89 



100-00 100-00 



