64 Notices respecting New Books. 



basalt, pseudo-basalt, porcellanite, thermantide, lydianstone, horn- 

 stone, petrosilex, and jasper." He prefers to call it jasper. 



This jasper, he says, belongs to the Lias, as is proved by the many 

 fossils it contains, and is covered conformably by the chalk. The 

 thickness of the Lias here is only from 1 metre to 27 metres (say 

 from 3 feet 4 inches to 8 feet), but it has under it a still more 

 altered portion, which has been examined by Sir R. Kane, and 

 found to contain augite and bronzite. 



It is traversed by veins, which become more numerous as we 

 approach the greenstone, and are themselves filled either with green- 

 stone or zeolites, while the stratification becomes more confused as 

 we approach the greenstone, till the two rocks seem almost blended 

 together. 



The greenstone is a dolerite very different in appearance from the 

 basalt which covers the country around. It is formed of greenish 

 Labradorite inmacled crystals of several centimetres (1 centimetre = 

 0'39, or nearly -pjths of an inch), and of blackish-green augite in 

 fine crystals. We can also distinguish protoxide of iron, and some- 

 times bronzed mica in plates of 1 centimetre. 



It is traversed by many zeolites, such as chabasite, natrolite, 

 mesotvpe, mesole, Harringtouite, Heulandite, stilbite, apophyllite, 

 Laumonite, aluminite, Scoulerite (Thomsonite), &c. It has also 

 veins of carbonate of lime, white, yellowish, and spathose, — of iron 

 pyrites, of stellite, and even of felspar, as also of augite, in very large 

 crystals. 



Tlie specimen examined by M. Delesse was taken from the large 

 quarry, and contained 4'22 of water, leaving in hydrochloric acid a 

 residue of 75 per cent. It contained no carbonate, as most trap- 

 rocks do. 



The normal lias near Portrush is blue, argillaceous, calcareous, 

 and consists, according to an analysis by Dr. Apjohn, of — 



Argillaceous and siliceous residue 5 6' 90 



Alumina 176 



Oxide of iron 7'43 



Water and loss 10"93 



Carbonate of lime 1902 



Carbonate of magnesia 3*94 



1 00- 00 



The lias metamorphosed into jasper splits into angular fragments, 

 and contains veins of zeolite like those before mentioned in the 

 dolerite. It may be divided into five varieties, varying in density 

 from 2-836 to 2-610, and in quantity of water contained, from 1-33 

 to 3-88. It melts easily but unequally at a red heat. It leaves a 

 residue of 76-75 in hydrochloric acid. A specimen of a blackish- 

 grey variety gave the following analysis : — 



