230 



NATURAL SCIENCE. 



March, 



are also often given. Mr. Hampson has " lumped " not a few 

 " species " ; for example, Protopavce orientalis, 13utl., is given as a form 

 of the European P. convolvnli, L. It is becoming more and more 

 evident that in many groups of Lepidoptera the terms " species" and 

 "variety" must be used according to the taste of the author. 



We are promised two more volumes of the work during the 

 next three years, bringing the series down to the end of the Pyralidae. 

 The remaining families are to be worked out by Lord Walsingham. 

 The volume before us will be gratefully received by students of Indian 

 moths, as it meets a real want, and will prove an excellent guide to- 

 future workers. 



Dover Coal Boring : Observations on the Correlation of the Franco-Belgian, 

 Dover, and Somerset Coal-fields. By Francis Brady, C.E. June, 1892. With 

 Reports by M. Victor Watteyne, Mons ; James McMurtrie, F.G.S., Radstock ; 

 and M. R. Zeiller, Paris. [No place of publication, printer, or date; but 

 Watteyne's Report is dated 16 July, 1892 ; McMurtrie's, 8 October, 1892 ; 

 and the section, 19 December, 1892] Pp.41. Map (South Wales to Liege), 

 and detailed section of boring. 



This is the official report on the boring to the westward of the 

 Shakespeare Tunnel, Dover, sunk at the instance of Sir Edward 

 \Vatkin, on behalf of the Channel Tunnel Company, in search for 

 ■workable coal seams thought to occur at this point. Although the 

 various Reports differ somewhat, the mysteries surrounding the 

 venture are now dispersed by the detailed section, from which we 

 gather that the following beds were penetrated, commencing at the 

 bottom of a 44 ft. shaft of g ft. diameter : — 



Depth. 



Ft. 



91 

 130 



138 

 186 

 256 

 259 

 1113 



1136-6 



1140 



1229 



1231 



1277 



1279 



1311-9 



1313 



1433 



1434 



i45(> 



1458-6 



1570 



15723 



17639 



1766 6 



1831 



1832-8 



2038 



2039 



2177 G 



2181 6 



Lower Grey Chalk . . 



Indurated Chalk Marl 



Chloritic Marl 



Light-coloured Gault 



Dark blue Gault 



Sandy Gault . . 

 (Various beds representing the Lower Cretaceous 

 ( and Jurassic 



Shale, Sandstone, and Bind 



Coal . . .... 



Shales, Sec, (with a 6 in. Coal) 



Coal 



Shales, &c. 



Coal 



Shales, &c. 



Coal . . 



Shales, &c. 



Coal 



Shales, &c. 



Coal . . 



Shales, &c. 



Coal 



Shales, &c. 



Coal 



Shales, Ike. 



Coal . . 



Shales, etc. 



Coal 



Shales, &c. 



Coal 



In the report by Mons 



41 



Watteyne, whicli follows the section, we 



read: ''The Coal-measures were reached in beds practically horizontal,. 



