96 PROFESSOR HEDDLE ON THE MINERALOGY OF SCOTLAND. 
1-3 grammes yielded— 
Silica, , ‘ , . 41°341 
Alumina, . : : . 10°532 
Ferric Oxide, . s , Loeoo 
Ferrous Oxide, . : me seh S510) 
Manganous Oxide, . : * 087 
Lime, : ; : ~ aeg2aes 
Magnesia, . : ‘ nf oe Oroe 
Potash, . 3 i ‘ *05 
Soda, ; : ; : a ii/ 
Water, F : j . 19°481 
99° 481 
Lost 15: 61 of the water at 212° ; insoluble silica, 3. 98 per cent. 
8. From the Catkin Hills.—This specimen was sent to me by Mr Joun 
YounG, curator of the University Museum, Glasgow, as being a portion of the 
very specimen, an analysis of which was published by the late WALLAcE YounG 
in the ‘“ Transactions of the Geological Society of Glasgow,” as “a new fibrous 
green mineral.” 
The portion analysed was minutely fibrous in structure, but was also coarsely 
pseudo-fibrous, from interstitial fibrous calcite. 
Its colour was dark leek-green ; it was softer than the nail, giving almost a 
white streak, and it was in no way physically different from some of the speci- 
mens above described. 
It yielded to acid (which was weakened so as to dissolve the interstitial cal- 
cite, with hardly any visible effervescence) 10° 714 per cent. of calcite. With 
this amount of calcite its specific gravity was 2 : 288, 
1:3 grammes freed from calcite yielded— 
Hannay. 
Silica, : : ‘ . 42°223 35°82 
Alumina, . ; ; » Se = aboot 
Ferric Oxide, . , ,. 2g92 4°85 
Ferrous Oxide, . J £9876 6°99 
Manganous Oxide, . > "073 
Lime, ‘ é ‘ : *919 4°87 calcite. 
Magnesia... nad el apie ‘lle 
Water, 7 j ; SO aoe 19°63 
100°313 = 100°03 
Loses 1476 of the water in the bath ; insoluble silica, 4 - 238, 
