48 Dr. Berger on the Isle of Man, 



yellowish and earthy when going to decay. There is some horn- 

 blende disseminated throughout the mass : a few crystals of lamellar 

 and transparent felspar are also imbedded in the basis. The rock 

 acts strongly on the magnet. It emits when breathed upon a sen- 

 sible argillaceous smell. 



fff f Sieniie. 



I noticed but one block forming part of the Druidical barrow 

 already spoken of. The texture is unusually close. The two in- 

 gredients are crystallized and intimately blended together. The 

 felspar fuses, but not readily, into a transparent enamel which is 

 not frothy. There are besides in the mass some very minute crys- 

 tals, of an yellowish colour with a vitreous lustre. (Qu. garnets?) 

 Specific gravity 2.932. 



ttttt 0//^./«. 



Several blocks of white and greasy quartz, some of which contain 

 yellowish talc, form one of the circles of the Druidical barrow in 

 Kirk Ballaugh. Sp. gr. 2.536. 



tttttt Garnet Rock. 



This rock, of an unusual occurrence I believe, I found under the 

 form of water-worn pebbles on the shore at Kirk-michael, and as 

 this is no place for vessels to lie at anchor, I have no reason to 

 think they could have been taken as ballast and thrown away 

 where I remarked them. The rock is highly magnetic, very hard 

 and tough. The mean specific gravity 2.967, the extremes being 

 3.085 and 2.846. The mass is of a liver-brown colour, v/ith many 

 crystals of an orange or reddish-brown cast imbedded in it. Their 



