58 



The analyses kindly furnished by Dr. Robert D. Thomson are as 

 follows : 



Specimen No. 1 is the saccharine marble from contact with the 

 dike at Kilchattan, in the highest state of alteration. 



No. 2 is the hard crystalline marble, having the crystals in distinct 

 flakes, more remote and less altered than No. 1. 



No. 3 is the unaltered limestone from the middle of the quarry, 

 remote from the dike, an average specimen. 



No. 4 is the altered limestone from contact with the overlying 

 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. 



" 



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



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



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



100-24 99-23 



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



I. II. 



: ........................... I 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 



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



I. II. 



I 9-70 9-08 



Alumina, ....................... > 



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



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



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



Water, coaly matter, and) ... A - 4 



i * i /"TtrtO T. / * 



carbonic acid, .............. ) 



100-00 100-00 



No. 4. 



I 64 . 21 64 . 46 



) 



Alumina, 



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



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



Carbonate of magnesia, ........ 4-62 2'85 



"Water and carbonic acid, ..... 1*75 4"89 



100-00 100-00 

 The silica present is in a state of mechanical mixture. 



