Geological Society. 527 



source. The next spring was encountered at the depth of 235 feet > 

 in a bed of white sand ; it flowed six feet higher, and was more 

 abundant than any of the preceding. The spring which issued 

 from the bottom bed was still stronger, and rose 2£ feet higher than 

 any of the others, or to within 24 feet of the surface. The lowest 

 pipe introduced into the boring had a diameter of three inches ; it 

 was worked with " two-lift pumps," the section-pipe of each being 

 two inches bore, for nine hours incessantly, during which 25,728 

 gallons were discharged. An analysis of the water was made by 

 Mr. J. H. Cooper, and a gallon was found to contain 9^ grains of 

 solid matter, or 4£ grains of oxide of iron, the remainder consisting 

 principally of common salt with a small admixture of sulphate and 

 carbonate of lime, and a trace of oxide of manganese. 



At Ham worthy, near Poole, another boring has been made, within 

 100 yards of the harbour, to the depth of 314 feet, through a 

 series of beds similar to those penetrated at Longfleet, and a similar 

 series of springs was tapped ; but as the boring was commenced at 

 80 feet lower level, or only 10 feet above low tide in Poole Harbour, 

 all the springs flowed over the surface, though not strongly. This 

 boring was abandoned on account of the sand which accumulated 

 in the pipe. 



The following is a section of the strata at the Longfleet Union 

 Workhouse : — 



Depth 

 No. of from the 



the Bed. Nature of the Bed. Thickness. Surface. 



Feet. In. Feet. In. 



1 . Black dirt and sand 40 40 



2. Gravel 40 80 



3. Fine yellow sand 15 23 



4. Clay 2 3 25 3 



5. Fine yellow sand 3 6 28 9 



6. Fine brown sand 2 3 310 



7. Coarse brown sand and water 5 6* 36 6 



8. Clay 16 38 



9. Hard fine blue sand 19 57 



10. Ditto, with white pebbles 2 9 59 9 



1 1 . Hard coarse blue sand 13 610 



12. Fine blue sand 22 83 



13. Coarse dark red sand 10 84 



14. Sulphuret of iron 3 84 3 



15. Dark brown clay 16 85 9 



16. White clay and sand 3 9 89 6 



17. Light blue clay 210 110 6 



18. Dark blue clay 2 112 6 



19. Light blue clay 4 116 6 



20. Light blue rock 2 118 6 



21. Red sandstone 16 120 



22. Light blue rock 2 122 



* The strata marked with an asterisk are those which threw out springs. 



