in tlio liiiilicst hcds of the Oolitic series (the Purbeck), the boring 

 at fi depth (if 1907ft. was still in Oolitic rocks. Now supposing 

 a line to be drawn from Xctherficld to Meux's brewery, at 

 Tottenham Court Road, .London, and another boring made along 

 its course in the neighbourhood of Knockholt Beeches, with the 

 view of as(-('rtaining the thickness of the Chalk and of the strata 

 between the Chalk and the Purbeck beds, we should probably get 

 a result like the following: — 



Chalk 700ft. 



Upper Greensand ... ... ... 30 



Gault 160 



Lower (xreensand ... ... •■■ 400 



Weald Clay and Hastings Wand ... 1,400 



Depth to Purbeck Eeds ... 2,690 



And though the Weald Clay and Hastings Sand might be expected 

 to be thin at London, a great thickness of Oolite beds would 

 naturally be looked for there. Put deep wells at Meux's brewery, 

 and some other places in or near London, show that the Gault 

 Clay is the lowest formation found there in its full thickness 

 Jjelow the chalk. For the continuity of the beds below the Gault 

 (Avliich are kno^^^l to exist both north and south of the environs 

 of London) is there broken by the existence of a ridge consisting 

 of roclcs older than any elsewhere met vnth in South-East England, 

 either at the surface or in the Sub-Wealden boring.* 



At the invitation of the President, Mr. Laughton gave a 

 short account of the remarkable Sunsets which had excited general 

 attention. There seemed very strong grounds for believing that 

 they are due to the presence, at a very great height, in the upper 

 regions of the atmosphere, of a quantity of fine dust, thrown up 

 by the eruption of Krakatoa on the 2Gth and 27th of August. 

 They are not peculiar to this, or any one part of the Avorld : they 

 have been reported from all quarters — Europe, Asia, Africa, 

 America, and Australia : it is therefore extremely unlikely that 



• For details see " Guide to the Geology of Loiidon and the Neighbourhood," 

 by W. Whitaker, B.A., F.G.S., of H.M. Geological S\.\r\ey.—Stanfo7-d 

 and others. Price Is. 



