180 Mr. S. V. Wood on the formation of the River- 



300 grains ; sulphate of magnesia, 2*97 grains ; nitric acid, 2*58 

 grains; sulphuric acid, 2*30 grains. 



In different solutions of chloride of sodium (and other neutral 

 salts) the increment or augmentation in the weight of the drop is in 

 proportion to the weight of the dry salt in solution. 



Table III. — Results of Experiment on the Weight of a drop of 

 different solutions of Chloride of Sodium at constant tempe- 

 rature 50°. 



Per cent, of salt 



in solution, 



r. 



Corresponding weight 



of drop in grains, 



to. 



Value of w by formula 

 w=2-84 + , 0135r. 







8-5 

 17 

 34 



2-84 

 2-93 

 307 

 3-30 



2-84 

 2-95 

 3-07 

 3-30 



The coincidence between the results in the second and third 

 columus confirms the law above enunciated. 

 Hastings, January 20, 1864. 



XXXI. On the Formation of the River- and other Valleys of the 



East of England. By S. V. Wood, Jun* 



[With a Map, Plate I.J 



THE valleys of the East of England contain within them- 

 selves so much evidence to show that their formation was 

 synchronous, and due to the same series of events, that I am 

 induced to attempt to trace their origin to its source. My object 

 is briefly to submit the evidence upon which I have formed the 

 opinion that the whole of this valley system has originated from 

 the denudation having been induced and regulated by earth- 

 quake disturbances that centred in two foci, one of which lies 

 immediately without the Valley of theWeald, and the other in the 

 sea off Brook Point in the Isle of Wight, both of them having 

 taken place while the sea of the upper drift covered the island. 



A careful study of the ordinary Ordnance maps will show that 

 the whole of the inequalities of surface in that part of England 

 which lies east of a line drawn from the Humber to the Cottes- 

 wold Hills are divisible into three distinct groups. The first of 

 these groups consists of a regular series of circles diverging from 

 a centre, as the circles of undulation diverge from the point 

 where a stone is dropped into water. The centre of these 

 circles lies about ten miles south-east of Canterbury, and from 

 it these concentric circles emerge at tolerably regular intervals, 



* Communicated by the Author. 



