144 Correspondence — /. M. Wilson — G. R. Wollaston. 



Witliam to Boston, first begins. It occupies a strip between the 

 river on the east and a ridge of Inferior Oolite covered with gravel 

 deposits on the west. The fen is of course thoroughly drained, but 

 is very ill supplied with drinkable water. This is got from dykes 

 which take the water from the oolitic region across the fen and 

 above its level ; and is of course at considerable distance from many 

 of the farm houses in the fens. 



What probability is there that a bore-hole made through the clays 

 that underlie the fen would tap a good water supply ? Is anything 

 known about the thickness of the clay, and the nature of the sub- 

 jacent strata? I am speaking especially of the fen that lies between 

 Bardney and Nocton, in which I am specially interested. 



A farmer there once told me it would be worth fifty pounds to 

 him to get water ; and I offered to spend twenty-five pounds on a 

 boring on the condition that if it succeeded he should pay me back. 

 He thought over the suggestion, and could not make it out. Why 

 should I pay if it failed f What good could it be to me ? He 

 thought there must be something uncanny about it, and he would 

 none of it. 



I think of making a boring there in April ; and should be truly 

 oblio'ed to any one who will give me information either by private 

 letter, or in the pages of this Magazine. 



James M. Wilson. 

 Rugby, Feb. 5th, 1874. 



"DOLMENS" OR "ERRATICS"? 



giB,^ — I send you a piece, broken off by mischief last November, 

 from a stone standing near the entrance to the bridle-way leading 

 from the top of Southampton Common to Lord's Wood. There are 

 three other similar stones in the neighbourhood. Oue is about 300 

 yards off, near Point-house, one in Burgess-street, and one in Lord's 

 Wood. Very likely there are, or at least have been, others. I have 

 known them a long time, and have often been puzzled as to their 

 object. The answer to all inquiries is : '•' Oh ! They are boundary- 

 stones." " Boundary-stones of what? " " Sure, sir, I can't say." 



They are nearly square prismatic stones, much weathered — indeed, 

 so much weathered that it was not till this one was broken that I 

 recognized them as G-ranite. The Granite is fine-grained, light in 

 colour, with a good deal of very black mica. 



What are these stones, and where do they come from from ? 



In the Hartley Museum there are two specimens of rolled green- 

 stone, said to have been discovered on the spot where the Museum 

 now stands. Gr. H. Wollaston. 



Clifton, nth January, 1874. 



Erkatum. — In the last Number, foot of p. 66, the Eev. 0. Fisher 

 ascribes Mr. J. Clifton Ward's paper on Coral Eeefs and the Glacial 

 Period to " Popular Science Keview" for April, 1873, whereas it 

 appeared in the " Quarterly Journal of Science" for that date.— Edit. 

 Geol. Mag. 



