6 ON THE USE OF LIME, MARL, AND SHELL-SAND. 



which, on account of the want of this essential qualification, are 

 not generally used for building purposes. An excellent oolitic 

 building-stone is the Dundry stone, which is quarried near 

 Bristol. A specimen of this stone, analysed by me, yielded the 

 following results : 



Water, driven off at 212 Fahr -230 



Water of combination '110 



Carbonate of lime .. .. 96-146 



Sulphate of lime ' '153 



Magnesia '470 



Protoxide of iron '540 



Alumina '120 



Soda -044 



Potash -296 



Silica 1-350 



99-459 



The church of St. Mary Redcliffe, Bristol, is built of this stone ; 

 the tower is of the twelfth, the body of the church of the fifteenth 

 century. Mr. Godwin, the restorer of this beautiful church, 

 informs me that he considers the Dundry stone quite as good as 

 Caen stone, which for some time was employed in the restoration 

 of this church, but which is now superseded by the Dundry 

 stone, of which the church was originally built. 



As it may not be uninteresting to compare with the preceding 

 analyses that of Caen stone, I may be allowed to mention here an 

 analysis of that stone and also two others of oolitic limestones 

 used for building. One of the latter represents the composition 

 of the oolitic limestone from Downside, Brackley Combe, near 

 Bristol ; the other that of the oolitic limestone, Combe Down, 

 Bath. The three subjoined analyses were made by Messrs. Ran- 

 some and Cooper : 



Composition of Oolitic Limestone, Caen, Normandy. 



Water .. .. 

 Silica .. .. 

 Protoxide of iron 

 Carbonate of lime 

 Magnesia 



1-91 



13-71 



73 



82-58 

 48 



99-41 



This stone is used for internal work in the new Houses of 

 Parliament, also in part of Westminster Abbey and in Canterbury 

 Cathedral. It is very fine-grained and well adapted for delicate 

 carvings. 



