294 PEOCEEDINGS OF THE AMERICAN ACADEMY 



from Nordhausen sulphuric acid was added cautiously to the iodtoluol, 

 at first keeping the mixture cold, aud finally heating it for some time, 

 the reaction was easily accomplished. To separate the resulting pro- 

 duct from the acid mixture it was treated with an excess of baric car- 

 bonate, heated to boiling, filtered, and concentrated on tlie water-bath. 

 On cooling, the barium salt of orthoiodtoluolsul phonic acid separated 

 in clusters of needles, which were much less soluble in cold than in 

 hot water. So far as it could be determined by any difference in solu- 

 bility or crystalline form of the barium salt, only one acid was formed. 

 By precipitating carefully with sulphuric acid the barium from a solu- 

 tion of the barium salt, and concentrating the filtered solution on the 

 water-bath, the acid was left as an oily liquid, which did not solidify 

 when cooled to 0°, or on long standing over sul{)huric acid. 



Baric Orthoiodtoluolsulphonate, Ba(C.IIgIS03)., . H H^O. — For 

 analysis the barium salt was prepared as above described, and dried 

 at first in the air, then at 100°. 



I. 1.2312 grm. of the air-dried salt lost 0.0407 grm. H.O at 100°. 

 II. 0.8011 grm. of the air-dried salt lost 0.0300 grm. lip at 100°. 

 III. 0.5967 grm. of the anhydrous salt gave 0.1888 grm. BaSO^. 



Calculated for Found. 



Ba(CjIl2lS03), . 1^ HjO. I. II. 



HP 3.54 3.31 3.G6 



Calculated for Ba(C,HuIS03),. 



Ba 18.G1 18.03 



CnJcic Orthoiodtoluohulphonate, Ca(CJIgIS03), . 2^ II.,0. — This 

 salt was prepared by neutralizing the free acid with calcic carbonate, 

 and evaporating the filtered solution on the water-bath. The air-dried 

 salt was heated to 100°. 



I. 0.02-13 grm. of the air-dried salt lost 0.0411 grm. H,0 at 100°. 

 11. 0.6250 grm. of the air-dried salt lost 0.0424 grm. 11,0 at'lOO°. 



Calculated for Found. 



Ca(C7H„IS03)j . 2i HjO. I. II- 



11,0 6.62 6.61 6.78 



0.7298 grm. of the anhydrous salt gave 0.1762 grm. CaSO^. 



Calculated for Ca(C,H(jIS03)j. Found. 



Ca 6.31 7.10 



Plumbic Orthoiodtoluohulphonate, Pb(C.HJSO,,)., . 2 II._,0. -— The 

 lead salt was formed by treating the free acid with plumbic carbonate, 



