294 Prof. Miller on some Crystallized Furnace Products. 



of the forms 1 1 0, 1 0, Oil, 3 23, 12 2, 2 1, 3 1 1 with 

 obscure indications of 6 5 5 and 611. _ _ 



The axis of the zone 1 1 1, 2 1, 113 4, 311, 10 4 3, 1 T 

 makes an angle of 30° with the axis of the zone 12 2, Oil, 

 12 2, 6 5 5, 3 2 2, 10 0, 6 1 1. The angles deduced from a 

 mean of the three observed angles are — 



Garnet. 



On a fragment of slag in the possession of Dr. Percy are im- 

 planted a few crystals having the appearance of a dark-coloured 

 garnet. One of these, nearly 2 millims. in diameter, having 

 very bright and perfect faces, on being measured with the reflect- 

 ive goniometer, proved to be a combination of the forms Oil, 

 2 11, like fig. 347 of the new edition of Phillips's ' Mineralogy.' 

 The slag in which the crj^stal occurs is said to have been found 

 in one of the Monkland furnaces, in the large accumulation, con- 

 sisting in great proportion of metallic iron, which forms in the 

 hearth of a blast furnace, and is commonly known by the term 



