COMPOSITION AND PROPERTIES OF NATURAL CEMENTS. 261 



TABLE 122. 

 ANALYSES OF "NATURAL PORTLAND' 



CEMENTS, BELGIUM. 



1. Compagnie Generate des Ciments Portlands de PEscaut, Tournai. 



2. Dumon et Cie, Tournai. 



TABLE 123. 

 ANALYSES OF NATURAL CEMENTS, ENGLAND. 



1. Sheppey. Quoted by Redgrave. "Calcareous Cements", p. 49. 



2. Harwich. " " 



3. Whitby. " Zwick, p. 74. 



4. London. 



Germany-Austria. Analyses of a number of German and Austrian 

 natural cements are given in Table 125. This series includes two inter- 

 esting analyses (Nos. 5 and 6) of cements of very low index, carrying 

 high percentages of magnesia. 



TABLE 124. 

 ANALYSES OF NATURAL CEMENTS, FRANCE. 



* See next page for references. 



