382 



STATE BOARD OF AGRICULTURE. 



proportions of lime and sulfur to be used, the proportion to be de- 

 termined by the purity of the lime. 



EFFECT OF MAGNESIA ON THE COMPOSITION OF LIME-SULFUR SOLUTION. 



These samples of lime were used showing the following analysis. 



TABLE VI. 



MgO 

 per cent. 



L Kelly Island Lime 



2. Bay Shore Superior Lime 



3. Baker and Adams Lime (From Marble) 



22.5 



10.2 



1.0 



From each of the first two lines, two samples of lime-sulfur were 

 made up, tlie first according to the formula 100 grams lime, 200 grams 

 sulfur and 800 grams water. In the second sample in each case, the 

 amount of lime was increased so that there was half as much calcium 

 oxide as sulfur, the amount of water remaining the same. From the 

 third lime, only one sample was made up and this in such quantities 

 that the ratio of calcium oxide to sulfur was one to two. Each sample 

 was boiled for one hour in a flask under a reflux condenser, filtered while 

 hot, allowed to cool and analyzed. In the following table the results, 

 for the sake of more accurate comparison, are given in actual percent- 

 age instead of grams per 100 cc. of solution as in the first experiment. 



From column 3 it will be seen that the amount of total sulfur in 

 solution in samples IB, 2B and 3B, in all of which the ratio of calcium 

 oxide to sulfur is as one to two, is very nearly the same, the greatest 

 variation being 0.2% between IB and 'SB. The greatest variation in 

 these three samples in which the calcium oxide and sulfur are in tlie 

 above ratio occurs in column 5, under the head of Total Sulfide Sulfur. 

 The variation between IB and 2B is 0.8%. This variation cannot be 

 ascribed to the fact that there was less magnesia in sample 2 than in 1, 

 because in sample 2 we find a larger amount of sulfide sulfur than in 

 3, which is much lower in magnesia. From these results we must con- 

 clude that the magnesium oxide present does not effect the amount of 

 sulfur going into solution providing enough of the lime is taken so that 



