112 



BRISTOL BUILDING STONKS. 



propose bowovor to return to this question, licro or else- 

 where, on, a future oooasion. The variability of tbe stones 

 is Remarkable. 



I feel pretty confident tlia,t the source of some at least of 

 these stones is Leigh Down, near Winford. Tlio stone therc^ 

 is, on the whole, similar in character to that of tin; porista- 

 Hths, sirailarly silicious, and (if I may ao say) similarly 

 variable. On the sides of the Down lie many detacbod 

 fragments, some of which socm to mo to have in one plac(; 

 •been arranged in a miniature circle. Leigh Down overlooks 

 a little tributary of the Chew. It is distant from tbe 

 Stanton Drew circles not more than 3| miles. Hence 1 

 believe the old Neoliths brought many of the stones for the 

 constrnction of their stone circles. Others are not improb- 

 ably from other sources, of which Bast Harptree is probably 

 one. I am. engaged on an investigation of the matter. 



APPENDIX. 



ExPEUIlVrKNTS ON TUB RlOSISTANCH Oli- SOMR BrTSTOT, BuILDIN(! 



Stones to CEUsnrNG Strf.s.s. 



TiiESH experiments were carried out in the University Col- 

 lege, Bristol, with the College testing machine. The primary 

 object was to ascertain the cUect of alternately freezing and 

 thawing, soaking and drying, heating and cooling the stones. 

 The vatiable resistance of the stones made these experi- 

 ments of little value ; still the tabic, as a record of practical 

 results, may not bo worthless. 



The cubes and prisms were prepared by Messrs. E. G. 

 Browne & Co., of St. Augustine's Parade. My thanks arc 



