534 Geological Society. 



of a higher class are beginning to reside on the island. Wallisea, 

 Mersea, and other islands have profited^in a similar manner. 



A great addition is made annually to the land along the coast of 

 Essex, and valuable districts, one amounting to five hundred acres, 

 and another to between one hundred and two hundred, have been 

 recently protected by embankments. Outside of these in closures 

 are tracts of sand, estimated equal to 33,000 acres, not yet covered 

 with vegetable mould, but dry eight hours out of every tide. To- 

 wards the close of 1837, preparatory steps were taken for forming 

 a company to inclose these sands, but Dr. Mitchell is of opinion that 

 they would not yield in 300 years a rental of 300 pence. 



To this paper was appended a notice, by the same author, of con- 

 stant and occasional outbursts of water from the chalk. 



Tlie localities of constant outbursts are, the Bourne Mill, near 

 Farnham ; the head of the river Mole, near the church at Merstham ; 

 (this river flows south of Ryegate to Dorking, below which town 

 the bed of the river is dry in summer, but an abundant stream passes 

 under the chalk, and reappears lower down ;) Leatherhead, close to 

 the Guildford road; the powerful spring near the church below 

 Croydon ; Orpington ; the Holy-well at Kempering, on the south 

 side of the North Downs ; the spring a quarter of a mile west of 

 Sittingboume ; Birchington, in the Isle of Thanet ; the Lyddon 

 Spout in the cliffs between Folkstone and Dover ; the Holy- well, at 

 the foot of the cliffs forming Beachy Head, one mile from East- 

 bourne ; the spring which is the source of the Chadwell, and the 

 main spring of the Amwell. 



Occasional Outbursts. — The Bourne, near Birchwood House. 

 During the last outburst, which was in the spring of 1837, the 

 water flowed in great volume to Croydon, and continued to do so 

 for six weeks. Later in the same year, another rivulet burst forth 

 in Gatton Park, between Merstham and Ryegate ; and a third in 

 Nonsuch Park, near Ewell. 



A communication was next read, entitled, "A notice on the dis- 

 covery of the remains of Insects, and a new genus of Isopodous 

 Crustacea belonging to the family Cymothoidse in the Wealden Form- 

 ation in the Vale of Wardour, Wilts," by the Rev. P. B. Brodie, 

 F.G.S. 



The quarry in which these fossils were found, is situated near the 

 village of Dinton, about 12 miles west of Salisbury. Not having 

 been worked for two years, its structure could not be clearly ascer- 

 tained, but the following section may be considered as affording a 

 near approximation to the order of the beds : — 



1. Clay, forming the surface, a few inches. 



2. White limestone 3 inches. 



3. Clay 2 to 3 — 



4. White limestone, similar to No. 2, "1 „ ^ a, 



containing shells and cypris .... J 



5. Crystalline grit with cvclas 2 — 



6. Clay ' 2 — 



