34 The Philippine Journal of Science i9i8 



Sodium carbonate. P. Rohland, Ber. d. deutsch. chem. Ges. (1901), 33, 2831. 

 ,The set is accelerated. No details are given. 



Sodium carbonate. N. Ljamin, Journ. Soc. Chem. Ind. (1902), 21, 972. 

 No comments are made. 



Sodium carbonate. P. Rohland, Zeitschr. f. angew. Chem. (1903), 16, 1049. 

 The set is first retarded and then accelerated. The results were similar 

 but different in degree for the several cements investigated. 



Sodium carbonate. P. Rohland, Journ. Soc. Chem. Ind. (1909), 28, 23. 

 The set is accelerated. 



Sodium chloride. Chandlot, Journ. Soc. Chem. Ind. (1889), 8, 543, 

 It. has no influence on either set or tensile strength. 



Sodium chloride. Dobrzynski, Journ. Soc. Chem. Ind. (1892), 11, 525. 



Sodium chloride solutions from 1 to 6 per cent were employed; most 

 of them caused a slight increase in the 7-day strength and a slight 

 decrease in the 28-day strength. 



Sodium chloride. P. Rohland, Ber. d. deutsch. chem. Ges. (1901), 33, 2831. 

 It has no effect. No details are given. 



Sodium chloride. N. Ljamin, Journ. Soc. Chem. Ind. (1902), 21, 972. 

 No comments are made. 



Sodium chloride. P. Rohland, Journ. Soc. Chem. Ind. (1909), 28, 23. 

 Small quantities have no effect. 



Sodium chloride. A. Passow, Tonind. Zeitg. (1914), 38, 995. 



Strength is increased by adding 0.5 to 1 per cent sodium chloride by 

 immersing the specimens in a salt solution. The effect is attributed 

 to the increased solubility of calcium hydroxide in sodium chloride 

 solution. 



Sodium sulphate. P. Rohland, Ber. d. deutsch. chem. Ges. (1901), 33, 2831. 

 The set is retarded. No details are given. 



Sodium sulphate. P. Rohland, Journ. Soc. Chem. Ind. (1909), 28, 23. 

 The set is retarded. 



Sodium sulphide. J. C. Witt, Phil. Journ. Sci., Sec. A (1916), 11, 273. 

 Small amounts retard the set, but larger amounts accelerate it. 

 The tensile strength is decreased. In general, the cements highest in 

 iron are most affected. 



Table I reveals that, regardless of the value of each paper 

 when considered alone, the general subject shows little progress.* 

 Aside from certain substances which have been investigated 

 in great detail by a number of workers — such as calcium sul- 

 phate — it is impossible to find much definite information in the 

 literature. In some cases an electrolyte has been investigated 

 by only one worker. As a rule, one paper does not cover suffi- 

 cient ground to make the work of general value. This is true 



' Cf. Desch, C. H., The Chemistry and Testing of Cement. Edward 

 Arnold, London (1911), 127. 



