Reviews — Report of the Geological Survey. 667 



results. A trongli containing balsam flowing upwards over an 

 obstacle under its own head of pressure was shown by the lantern 

 upon the screen. 



A raised model of Ireland had been constructed, and the directions 

 of ice-movement as determined by the Rev. Maxwell Close indicated 

 upon it by arrows ; on allowing water streaked with colouring 

 matter to flow over it from two areas supposed to represent the 

 great gathering grounds of snow of the Glacial period, the water 

 had taken paths, as shown by coloured streaks, corresponding to 

 those taken by the ice as shown by the arrows, a concordance in 

 every way remarkable. 



la IE] ATI IE "VT" S. 



I. — The Geological Survey. 



rrUE Eeport for the year 1894 of Sir Archibald Geikie, Director- 

 \_ General of the Geological Survey of the United Kingdom and 

 Director of the Museum of Practical Geology, has reached us some- 

 what late in the present year. This is the more to be regretted, as 

 the Report contains (in addition to the statistics relating to field- 

 work, museum-work, and publications) a record of the chief scientific 

 results obtained during the year. 



Of the entirely new area in course of survey, that of the Isle of 

 Man first calls for notice in the account of work done in England 

 and Wales. There Mr. G. W. Lamplugh has discovered certain 

 conglomerates in the Skiddaw Slate group, which he believes to 

 have been produced by the breaking up of sandy slates and grits 

 under intense shear strain. Unlike ordinary crush-breccias the 

 included fragments often assume the characters of pebbles, rounded 

 by attrition. The subject has been fully brought before the 

 Geological Society, so that further reference here is not needful. 

 No fossiliferous zones have as yet been determined in the Skiddaw 

 Slates. With regard to glacial phenomena, the general march of 

 the ice during the height of glaciation is noted to have been from 

 si>me point west of north. It is stated that a bed of fine warp or 

 silt in the glacial series of Kirk Michael may prove to be of some 

 economic value : it has been used locally as a fuller's earth. 



In areas that are being re-surveyed, those of the South Wales and 

 other coal-fields are, without doubt, the most important. Portions 

 of Glamorganshire, Brecknockshire, and Monmouthshire are being 

 mapped by Messrs. J. R. Dakyns, A. Strahan, and W. Gibson, and 

 in these (as in all other) areas where the Geological Survey is now 

 engaged, the six-inch Ordnance Maps are utilized in the work. 

 It is interesting to learn that, on the eastern border of the great 

 coal-field, the several subdivisions of the Old Red Sandstone at 

 present observed, appear to pass into each other, from the red marls 

 and sandstones with cornstones up to the red sandstones, quartz 

 grits, and conglomerates. The Carboniferous Limestone Series, as 

 is well known, exhibits marked variations in the thickness of its 



