302 



BOOK NOTICES. 



as if they were of no age at all. The geological date of even intru- 

 sive masses can, in most cases, be made out, either with certainty or 

 with a high degree of probability. 



A few pages are given to the subject of Mineral Veins, and an 

 interesting discussion of Denudation and Scenery, with plentiful local 

 examples, concludes the book. There are, however, two appendices, 

 one being a synopsis of the Animal Kingdom, by Mr. E. T. Newton, 

 and a very full index. 



The hundred illustrations, gathered from a variety of sources, are 

 judiciously chosen and well executed. There is also a folding 

 geological map, prepared by 'Mr. Goodchild, which is clear, and 

 seems fairly accurate. The accidental omission from this map of 

 the South Yorkshire and Derbyshire coal-field has been remarked by 

 another critic. Altogether, Mr. Woodward may be warmly con- 

 gratulated on his work, ^vhich will prove useful alike to the local 

 geologist, the teacher, and the traveller. — A.H. 



Report on the Migration of Birds in the Spring and Autumn of 



1886. By My. J. A. Harvie-Brown, Ur. J. Cordeaux, Mr. R. M. 

 Barrington, ^Ir. A. G. More, and Mr. W. Eagle Clarke. Eighth 

 Report (Vol. II, No. 3). Edinburgh : ^I'Farlane & Erskme. 



1 88 7. Svo, 174 pages and map. 



It is gjratifvinoj to notice the excellent work in course of accom- 

 plishment by the keepers of our lighthouses and light-vessels, and 

 the Committee appointed by the British Association to report on the 

 migration of birds are to be congratulated upon the energy which 

 they have brought to bear upon the large amount of materials 

 furnished by their observers during 1886. It is to be regretted that 

 the reports for East and West coasts appear to be compiled without 

 any reference to one another. Mr. Eagle Clarke alone has made 

 clear the seasonal movements of the species (104) observed upon the 

 West coast, with due reference to sudden rushes of birds. 



Thus, while Mr. Cordeaux is content to state that in 1886, ' as in 

 1885, the main body of immigrants crossed in two great rushes, 

 corresponding with the first and third weeks of October,' these 

 movements being ' considerably earlier than the chief general move- 

 ments of the preceding year,' Mr. Clarke neatly summarises the 

 spring and autumn movements 7C'iy/i due reference to meteorological 

 conditions. The defect of all the reports, except that just mentioned, 

 is that they leave the bewildered student to dra\v his own conclusions 

 from the large mass of data referred to special species. What is 

 really required is that a complete summary of the movements of 



Naturalist, 



