60 Analyses of Books. .(Juty, 
description he gives of it. He will find this rock always the same 
in its appearanee, whether it occur in primitive, transition, or 
floetz formations. Therefore, like lime-séone, it must always 
bear the same name. Good specimens of primitive green-stone 
may be met with in the neighbourhood of Crieff. Ido not recol- 
lect to have met with them any where else in Scotland. I do not 
understand what is meant by the floetz green-stone being inde- 
pendent of the rocks with which it is associated. If Dr. M. will 
travel from Kelso to Sutra Hill, on the road to Edinburgh, he will 
find in the southern part of his journey, abundance of very cha- 
racteristic specimens of floetz green-stone. As he advances north- 
ward, he will find these characters slowly and almost imperceptibly 
changing, till at last the rock at Sutra Hill is pure grey-wacke. 
In this part of Scotland the transition from green-stone to grey- 
wacke may be distinctly traced. What is more common than to 
find green-stone passing into basalt, into wacke, and even into 
slate-clay? Such transitions must be familiar to every person who 
has examined the rocks about Edinburgh and in Fife. 
The Shiant Islands, near Lewes, are composed of trap; but the 
Doctor’s descriptions are not sufficiently minute and precise to 
enable us to know the individual species. He terminates his ac- 
count, as usual, with an invective against the inaccuracy of the 
present nomenclature of rocks. Perhaps a more minute attention 
than he seems to have paid to the Wernerian division and descrip- 
tion of trap rocks, would have induced him to alter his opinion 
upon this subject. It appears to me an odd way of proceeding to 
estimate the progress which a science has made, by our own pro- 
gress in the knowledge of it. 
The Island of Rum is of so difficult access that it was only par- 
tially examined. The lowest rock found was a sand-stone, sup- 
posed to have been formed from granite. Over this was a green- 
stone, composed of augite and felspar, which Dr. M. thinks 
peculiar to Rum. It occurs, however, in East Lothian. Over 
this is an amygdaloid, containing chalcedony, heliotrope, and 
plasma. The occurrence of these two last minerals in this place 
had been previously pointed out by Professor Jameson. 
The Scuir of Egg, which in magnificence far exceeds the cele- 
brated columns of Staffa, was first pointed out by Professor Jame- 
son. Dr. M. says these columns are composed of black pitch-stone 
porphyry. I believe, with Professor Jameson, that they consist of 
a mineral intermediate between basalt and pitch-stone. 
Dr. M. gives an account of a very extensive lime-stone forma- 
tion, beginning at Assynt, and running east, and alternating with 
a quartz rock. He calls it bituminous lime-stone. This name is 
not correct. It contains carbon, and emits, when rubbed, the 
smell of sulphureted hydrogen. It belongs to the well-known 
lime-stone formation, described and analyzed by John, under the 
name of Jucullite. It is not possible, from Dr. M.’s description, 
to make out its geognostic relations. 1 have little doubt that it is a 
