232 Reviews — Harrison and Jukes-Browne^ s Barbados. 



tbe majority of observers must be content to use the word 'schist' 

 in its wide practical signification, covering all well-foliated rocks, 

 of whatever age, which fall short of the coarser and more felspathic 

 type styled gneiss." 



The final section of the work is devoted to the examination of 

 those fossils which are of especial value for stratigraphical pui'poses. 

 The Invertebrata alone are treated, and an attempt is made to define 

 in scientific terms each of the more conspicuous genera, often with 

 an illustrative woodcut. This plan is a great improvement upon 

 the time-honoured custom of recording lists of names of fossils with 

 merely incidental allusions to their characters, of which occasional 

 figures are supposed to give an adequate conception. The subject, 

 however, is so vast that we doubt whether Prof. Cole's brief outlines 

 will in many cases sufiSce for the requirements of an ordinary worker 

 in unknown regions, and we trust that some day the scheme may 

 be further elaborated. 



It is difficult to criticize a work of this nature ; every specialist 

 will hold his own opinion with regai'd to the particular section that 

 concerns his own line of research. We are inclined to think, how- 

 ever, that in some instances simple matters might have received 

 more attention. In certain strata, for example, a sufficiently accurate 

 determination of the true dip can readily be made by employing a 

 spirit level to ascertain the line of strike and fixing the clinometer 

 at right angles to this, without any of the geometrical constructions 

 such as Prof. Cole alone describes. But we have most serious fault 

 to find with the publishers. In a work so admirable both in 

 subject-matter and typography, the coarseness and inartistic character 

 of so large a proportion of the new figures is a blemish of which it 

 is impossible to speak too harshly. In this respect, it forms a 

 striking contrast to the scientific handbooks issued by publishers 

 abroad, and we trust that in the next edition the fault may be 

 entirely remedied. That such an opportunity will soon present 

 itself we are fully assured, for the volume is one that will prove 

 invaluable and be welcomed by all students of Geology. 



YIII. — The Geology of Barbados. By J. B. Harrison and A. J. 

 Jukes-Browne. 8vo. pp. 64 and Map. (Published Barbadoes ? 

 1890.) 



SO long as it is argued that the Glacial period in England was 

 due to the diversion of the Gulf Stream will geologists feel 

 interested in all investigations upon the later Tertiary geology of 

 the West Indies. The island of Barbados moreover, possesses an 

 additional source of interest in the Radiolarian deposits so long noted 

 for the beauty of their fossils, and now of especial value from their 

 bearing on the question of the permanence of oceans and continents. 

 We must, therefore, feel much gi'atitude to the authors of this 

 memoir for the care with which they have worked out the geological 

 structure and past history of Barbados, and for the first time 

 definitely established the relations of the series of deposits of which 

 it is composed. 



