486 Intelligence and Miscellaneous Articles. 



3. " On the Sections of Strata exposed in the Excavations for the 

 South High-level Sewer at Dulwich; with Notices of the Fossils 

 found there and at Peckham." By Charles Rickman, Esq. 



In the autumn of 1859, open cuttings were made at Peckham, in 

 connexion with the " Effra branch of the Great South High-level 

 Sewer," for the "main drainage" of the metropolis south of the 

 Thames ; and in the following spring a tunnel (330 yards in length) 

 was being constructed under the Five-fields at Dulwich. The beds 

 exposed in both sections belonged to the " Woolwich and Heading 

 Series " of the Lower London Tertiaries (Prestwich) . 



Four shafts were sunk to facilitate the driving of the tunnel ; and 

 the following beds were exposed ; but, as some of the beds are not 

 persistent, but die out even within the extent of the tunnel, the 

 several shafts differed as to the sections obtained from them. 



1. Soil, 9 inches. 2. Loamy clay (probably London Clay) ; 12 ft. 

 Not in shaft No. 1 (the most easterly), nor in No. 4 (the most 

 westerly), owing to the convex surface of the ground. 3. Light- 

 coloured clay ; 6 to 9 ft. 4. Reddish sand ; 5 ft. Not in No. 4 shaft. 

 5. Dark clay; 1 ft. 10 in. 6. Blue clay ; 2 ft. Not in No 4. 7. 

 Dark clay ; I ft. In No. 1 only. 8. Paludina-bed ; 6 to 15 inches. 

 Fossils : Pitharella Rickmani (Edwards), Paludina lenta, P. aspera (?). 

 Bones and scales of Fish. Leaves. 9. Cyrena-bed ; 1 to 2 ft. 

 Cyrena cunei/ormis, &c. 10. Oyster-bed ; 1 to 3 ft. Ostrea tenera, 

 O. pulchra, 0. Bellovacina, 0. elephantopus, 0. edulina, Bysso-arca 

 Cailliaudi (?), Cyrena cunei/ormis, C. deperdita, C. cordata, C. ob- 

 ovata, Melania inquinata,Melanopsis brevis,Modiola elegans, Fusus (?), 

 Calyptrcea trochi/ormis, Corbula. 11. Loamy sand ; 8 in. In No. 4 

 only. 12. Red sand ; 2 ft. In No. 4 only. 13. Blue clay ; 2 ft. 6 in. 

 Leaves. 14. Dark sand ; 8 to 28 in. 15. Blue clay ; 18 in. to 

 9 ft. Laminated ; rich in Leaves, Lignite, Seed-vessels. Rissoa, 

 Cyrena Dulwichensis (Rickman). 16. Dark sand ; 2 to 4 ft. 17. 

 Light-coloured clay; 2 ft. 6 in. In No. 4 only. 18. Shell-rock; 

 4 ft. thick, sometimes intercalated with stiff blue clay. Cyrena 

 Dulwichensis (Rickman), C. cordata, C. deperdita, C. cunei/ormis, 

 Melania inquinata, Melanopsis, Neritina, Pitharella Rickmani (Ed- 

 wards), Unio, Teredines in Lignite, Scutes of Crocodile, Fish-scales, Che- 

 Ionian and Mammalian bones. 19. Clay ; 14 ft. and more. Reached 

 only by the main shaft, No. 3, which appears to have been sunk at 

 the apex of a low anticlinal ; the beds gently dipping away E.and W. 



All the fossils appear in their respective beds both at Peckham 

 and Dulwich. 



LXV. Intelligence and Miscellaneous Articles. 



ON THE RELATION BETWEEN THE DIRECTION OF THE VIBRATION 

 OF LIGHT AND THE FLANE OF POLARIZATION. BY F. EISENLOHR. 



To the Editors o/ the Philosophical Magazine and Journal. 

 Gentlemen, — I observe that Mr. Stokes has some remarks in your 

 Periodical for December 1859, upon a paper of mine, which was first 

 published in the 104th volume of PoggendorfTs Annalen, and trans- 



