EXPERIMENT STATION BULLETINS. 



381 



After making up the solutions, samples were drawn off, filtered while 

 hot, and after cooling were analyzed. The results of the analyses are 

 given in Table V. The letters A and B in column 1 indicate the formula 

 used, A for the 60-125-60 formula and B for the 50-100-50 formula. The 

 results are expressed in grams per 100 cc. of the original solution. 



TABLE V. 



Comparing the above two tables, it is found that in a general way 

 the amount of total sulfur in solution varies inversely with the amount 

 of magnesium oxide present in the lime used. If we arrange the above 

 samples according to the amount of total sulfur present, we have them 

 in the order 2. 6, 3, 1, 4, and 5. If we arrange them according to the 

 amounts of magnesium oxide present in the lime, we have the order 

 5, 1, 4, 3, 6 and 2, which, with the exception of samples 1 and 4, is 

 the above order reversed. Samples No. 1 and 4 are veiw nearly alike, 

 both in the amount of sulfur in solution and in the amount of magne- 

 sium oxide present in the limes used, the variation being so small it is 

 not strange that in the case of these two samples the order is not re- 

 versed. This may have been brought about by a slight variation in 

 the amount of steam condensation in the two cases, this variation caus- 

 ing a corresponding variation in the concentrations. 



This evident relationship between the amount of sulfur present and 

 the percentage of magnesia in the lime might be due to a harmful effect 

 of the magnesia or it might be due to the fact that when a definite 

 formula is used, such as the 50-100-50 formula, the percentage of cal- 

 cium oxide present is cut down in the exact ratio in which the mag- 

 nesium oxide is present, thus reducing the efficiency of the lime. 



From the above data no conclusion can be drawn as to which of the 

 formulae used is the better. In each, since the lime is never pure 

 calcium oxide, the sulfur is in excess. In some cases it is found that 

 formula A gives better results, in others formula B. These variations 

 (which are small) are probably due to variations in the amount of 

 steam condensation. If one of the formulae is to be used the 50-100-50 

 formula is less expensive and gives as good results as the 60-125-60. 

 Later in the paper however, a recommendation will be given as to the 



