Reviews—Dr. A. Geikie’s Text-Book of Geology. 39 
Silurian rocks of S.W. Mayo and N.W. Galway. One group of these 
beds was called by Jukes the “Dingle or Glengariff Grits,” and 
they comprise a red arenaceous type of accumulation, coarse in 
nature. Mr. Kinahan points out that this type is no indication of 
relative age, for although the rocks are more often above the other 
group of finer accumulations, of a green and grey argillaceous type, 
yet this is not always the case; and he endeavours to show, with the 
aid of sections, that the Silurian strata having been deposited in 
separate basins, the littoral rocks usually coarse, must be on different 
horizons. Referring to Dr. Archibald Geikie’s paper ‘‘On the Old 
Red Sandstone of Western Europe,” and the five ‘“‘ Basins of Deposi- 
tion”’ therein suggested, Mr. Kinahan observes that, if extended into 
Ireland, the Lake Caledonia or Middle Scottish Basin might be called 
the Ulster and Connaught Basin, and the Welsh Lake Basin the 
South Munster Basin. 
The evidence brought forward in this Report goes to show that 
these Silurian rocks [ Lower Old Red Sandstone] rest unconformably 
on Cambrian or Cambro-Silurian [Lower Silurian] rocks, and are 
overlain unconformably by Carboniferous rocks. H. B. W. 
gy 2a Vie SEIN Se 
ES DC 
J.—TrxtBook oF GeEotocy. By Arcurpatp Getxis, F.R.S., LL.D., 
Director-General of the Geological Survey of Great Britain and 
Ireland. (London: Macmillan & Co., 1882.) 
HE absence of a general Text-book in which all the departments 
of the science receive a fairly equal amount of attention has 
long been felt to be a great want in British Geology. Of late years 
we have had nothing on this side of the Atlantic that could be com- 
pared for a moment in general interest and completeness with the 
American Manual of Dana. The classical ‘““Hlements” of Lyell were 
excellent in their original form, but as transformed into the later 
“Student’s Elements,” they have lost much of their former attraction, 
while the order of description of the formations has always appeared 
to us to be unnatural. The well-known manual of Page, which has 
made many a geologist in its day, is, on the whole, too much of a 
compilation for the ambitious student of the present time, and too 
small as a work of reference. The manual of the late Professor 
Jukes was all round the fairest and best work upon the subject. 
Jukes’s manner was irresistibly attractive. His absorbing love for 
his subject glowed through every page. He had a way of taking his 
reader into his confidence which made the pupil regard him less as 
a master than as a hearty friend. In the sunshine of his presence, 
in his utter unconsciousness of personal dignity, in his carelessness 
of authority as such, in his honesty of purpose in the search for 
truth, and his belief in that of his pupil, the reader was impelled 
swiftly forward, and was inspired, if not with a fruitful love of the 
science itself, at any rate with a profound respect for its methods, 
and a confidence in the perfect reliability of its widest conclusions 
that never left him. 
