230 NATURALS ClENCE, Marcu, 
are also often given. Mr. Hampson has “lumped” not a few 
‘‘ species’; for example, Prvotoparce orientalis, Butl., is given as a form 
of the European P. convolvuli, 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 Pyralidz. 
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 Coat Borina: 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 Liége), 
and detailed section of boring. 
Tuis is the official report on the boring to the westward of the 
Shakespeare Tunnel, Dover, sunk at the instance of Sir Edward 
Watkin, 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 9 ft. diameter :— 
Depth. Thickness. 
Ft. Ime, whe 
gl Lower Grey Chalk .. bre ats oe sco BOLERO 
130 Indurated Chalk Marl ae ae i Sau 30) © 
138 Chloritic Marl ; Bf Be — oc 8 oOo 
186 Light-coloured Gault ae a 56 a2) 40RO 
256 Dark blue Gault a ss i oe oo 7) © 
259 Sandy Gault .. 3} @ 
ie { Various beds representing the Lower Cretaceous } Bhcig 
3 {and Jurassic J O54 
1136°6 Shale, Sandstone, and Bind Se ae a 226 
II4o Coal. Ee ae ee ne 3% Rs A 
1229 Shales, &c., (with a6in. Coal) .. ae bs) SSSMUG 
Tir Coal i ae oN oe Be as 2 
1277 Shalesvcs) ae ke ae a Be ne 4I oO 
1279 Coal. se Ss oe as as ate 2G 
I3I1I'9 Shales, &c. .. we ae At Se no 25 oC 
1313 Coalire Hi ss ae a a x res 
1433 Shales, &c. .. oy ae ac ie ee) E20) NO: 
1434 Coal. See ae, sie atc ae aks TO 
1450 Shales, &c.  <: ws 5c 35 oe sor ee EO 
1458°6 Coaleea. af ae ae ae a a 2 6 
1570 Shalescccane as ca a ve EELOO EMO 
15723 Coal: hs St ae - are 50 23 
1763'9 Shaless.cZcy ee: se aA te ad 5a alee 
17666 Coal aa ee fs is ss <a 219 
1831 Shales, &c. .. ae ie ae A. - 64 6 
1832'8 Coalae af ce Sic a6 $0 sre it 8) 
2038 Shales cccamerr ee ca Ai 56 Ae 207kO 
2039 Coal eee ae ws ate éxe a ie i © 
2177'6 Shales) &cyssae 56 3% 36 36 sa HEE 
2181'6 Coal. ae : oe 4 0 
Ia the report by Mons. Watts. co Ditee the section, we 
read: ‘‘ The Coal-measures were reached in beds practically horizontal, 
