6, YORKSHIRE. ii; 



Obs. The conftituent parts of this reii- 

 duum refcmble thofe of the lall fpecimen ; 

 excepting the abfence of the mud, which has 

 evidently been wajljed away ; and except- 

 ing the prefence of a mucilaginous matter, 

 whofe nature I am not at prefent able to 

 guefs ; nor have I leifure at prefent to pur- 

 fuc the enquiry. 



Gen. Obs. i. All thefe cements, whether 

 weak or ftrong, have laid hold of the ftones 

 with a degree of firmnefs proportioned to 

 their refpeClive flrengths. Every crevice of 

 the wall is filled with cement : the whole 

 form one united mafs. 



Hence it is more than probable that thef<; 

 cements have been poured into the walls in a 

 liquid date, in the {late o^ puddle ; and they 

 appear to have operated, with refpedt to com- 

 padnefs, as x.\\t puddle of the canal-makers. 



2. The fubjccts of Exp. 3, and 4. are 

 llrong evidences, that in the preparation of 

 thefe puddles the ancient builders were very 

 deficient. Not more than half of the lime 

 they contain appears to operate. The lumps, 

 y/hcther large or fmall, are w^r^ than wafted; 

 I 3 weakening. 



