Revieivs — Prof. Hedclle — Geognosy of Scotland. 371 



of the ornati, and tliis group, in places, succeeds the ParMnsonii 

 zone of the Bajocian. 



Contrary to expectation, part of the Portuguese Jurassic presents a 

 strong analogy with that of the Anglo-French basin, but in the 

 south the Alpine facies predominates. A very curious and complex 

 subject is that of the relations between the northern and the Alpine 

 facies. At page 5^ he gives a sketch-map of their respective limits 

 from the Atlantic to the Tyrol, as shown in the several formations. 

 The lines run approximately N.E. — S.W. Several measured sections, 

 sometimes illustrated by rough diagrammatic cuts, constitute a sort 

 of appendix to the work, which will readily commend itself to all 

 interested in tracing the various phases of development which the 

 Jurassic beds present in Western Europe. W.H.H. 



IV. — The County Geognosy and Mineralogy of Scotland. By 

 M. Foster Heddle, M.D., F.R.S.E., etc.. Professor of Chemistry 

 in the University of St. Andrews. 



AT intervals, during the last four years, there have been published 

 in the pages of the Mineralogical Magazine several instalments 

 of a remarkable work, which appears to us to have especial claims 

 upon the attention of British geologists. In this work, which is 

 entitled " The County Geognosy and Mineralogy of Scotland," Prof. 

 Heddle (the eminent chemist and mineralogist of the University of 

 St. Andrews) proposes to perform for the whole of Scotland what 

 was so brilliantly accomplished by Maculloch for the Hebrides and the 

 Western Highlands. In his preface, however, Prof. Heddle modestly 

 defines his work as a chronicle of the present state of our knowledge 

 of the mineralogy of the northern portion of the kingdom, and pro- 

 poses to treat of the geognosy and lithology merely to such an extent 

 as to explain the position of the minerals themselves. 



Prof. Heddle has so long been recognized as the first of living 

 Scottish mineralogists, and his familiarity with the minerals and 

 mineral localities of his native land is so unrivalled, that such a 

 work as the present comes most naturally from his hands ; and he 

 has accomplished his task so far with a fullness and thoroughness 

 that is worthy of himself and his subject. Each county (com- 

 mencing at the extreme N. of the British Islands) is taken up 

 separately, its general geognostic and lithological features sketched 

 in outline, and its chief minerals and mineral localities, etc., dis- 

 cussed at length. The minerals themselves are arranged in the 

 order of the geological formations which yield them, and figures 

 and complete analyses of the more important or interesting forms 

 given in much detail. The work is illustrated also by a series of 

 coloured geological maps, in which the main geological and litho- 

 logical features of the several districts described are laid down. 



Eight instalments of the work — embracing the counties of Orkney 

 and Shetland, Caithness, and Sutherland — are already in print, and 

 from these the probable nature and calibre of the work may easily 

 be inferred. 



The purely mineralogical portion of the work must be left to the 



