114 



though rendered chemically impure by the entrance of the sewage 

 from a town of some 800,000 people, atter efficient filtration was 

 drunk without ill effects. This instance occurred in the town of 

 Hamburg during the recent cholera epidemic. The water supply 

 was direct from the Elbe, which, though chemically fairly pure, 

 contained the bacilli of cholera. The town of Altona, a little 

 farther along the river, used the river water as its supply after it 

 had received the sewage of Hamburg, but cases of cholera there 

 were very few indeed. It seems, likely therefore, that in future, 

 chemical and bacteriological analyses of water must go hand in 

 hand if we wish to obtain the fullest benefit from the scientist's 

 work. 



XXVIII. 



EAST KENT NATURAL HISTORY SOCIETTS EXCURSION 

 TO HAERIETSHAM AND LENHAM, 



24th May, 1893. 



Report ly Mr. G. Dowher, F.G.S., Conductor for the day. 



The party, after leaving Harrietsham railway station, passed 

 by the Church and ascended the hill till they came to the 

 "Pilgrims' way," skirting the great chalk escarpment of the 

 North Downs. This track, the director remarked, was a very 

 ancient road which probably existed before the Koman occupation 

 of Britain. Thence proceeding eastward to Elintbarn the party 

 entered the chalk pit that has a geological interest because in it 

 there existed a large pipe of the Pliocene red sand which had been 

 figured and described by Mr. J. Prestwich.* Halting at this spot, 

 the geological structure of the County was explained, and then an 

 ascent was made to the top of the downs. The red sand noticed 

 as filling the pipes in the chalk was stated to cap the hills, not 

 only here, but south-east as far as Folkestone. Mr. Prestwich, in 

 the paper referred to, considered that these did not belong to the 

 eocene beds of like lithological character found in East Kent at 

 Eoughton Hill, and beneath the London Clay at the Eeculvers, 

 and from the absence of fossils their date remained unknown, 

 until Mr. Harris, of Charing, found casts of fossils in the sandpipes 

 there, which were identified as belonging to the Crag series. Thus 

 the fectiou had a great geologicfd interest, for in England the 

 Crag beds were only met with in the eastern parts of Norfolk and 

 Sufi'olk, whilst geologists had formerly limited the Crag sea to the 



* See Quarterly Journal of Geological Society, vol. xiv, 1858. 



