84 . Geological Society :• 



Tables (continued). 



Hence the formula H* R^ 0* will represent the general type for 

 an acid, where H* represents the atoms of hydrogen, which, save in 

 carbon compounds, are found to vary only from 1 to 4 ; where 

 Ry represents the acid radical, that is the chlorine, or sulphur, or 

 phosphorus, or carbon, &c. which gives the special character to the 

 acid, and which, save in carbon compounds, is usually confined to 1 

 or 2 elementary atoms; and where O* represents the atoms of 

 oxygen, which generally range from to 4, but occasionally extend 

 to higher numbers. , 



GEOLOGICAL SOCIETY. 

 [Continued from vol. xix. p. 408.] 

 April 18, 1 860.— General Portlock, Vice-President, in the Chair. 

 The following communications were read : — 



1. " On a Well-section at Bury Cross, near Gosport." By James 

 Pilbrow, Esq. In a letter to the Assistant-Secretary. 



This well, which was dug to a depth of 110, and bored 221 feet 

 deeper, appears not to have penetrated the Bracklesham series of 

 sands and clays, many of the characteristic fossils of which, obtained 

 from the well, were exhibited by Mr. Pilbrow, together with speci- 

 mens of the beds perforated. The yield of water in this well is very 

 copious, certainly equal to 500,000 gallons at about 70 feet from 

 the surface. When not pumped, the water rises to about 9 feet from 

 the surface. 



2. " On the presence of the London Clay in Norfolk, as proved 

 by a boring at Yarmouth/' By J. Prestwich, Esq., F.G.S. 



In 1840 Sir E. Lacon and Co. commenced a well, for the supply 

 of water to their brewery, and had a shaft dug to the depth of 22 

 feet, and then a boring made to the depth of 597 feet, entering the 

 Chalk, but stopped by massive flints. The work was unsuccessful ; 

 but the specimens of the strata were carefully preserved : Mr. 

 Prestwich and Mr. Hose lately examined them, and the following 

 is Mr. Prestwich's opinion of the strata that they represent: — 

 Blown sand and shingle, about 50 feet ; recent estuarine deposits 

 (with Ostrca edulis, Cardium edule, Corbula Nucleus, Tellina Bal- 

 thica, T. planuta, Cyprina Islandica, Pecten operculars, Mytilus, and 

 Balanus), 120 feet ; London Clay, 310 feet ; Woolwich and Reading 

 series, 46 feet; Chalk, 57 feet. 



This section is interesting as being illustrative of the estuary and 



