OP ARTS AND SCIENCES. 295 



filtering, and evaporating on the water-bath. The air-dried salt lost 

 two molecules of crystal water at 100°. 



I. 1.2580 grm. of the air-dried salt lost 0.0o62 grm. H,0 at 100°. 



II. 1.2538 grm. of the air-dried salt lost 0.0512 grm. H^ at 100°. 



III. 0.7176 grm. of the air-dried salt lost 0.0294 grm. H.O at 100°. 



IV. 0.6163 grm. of the anhydrous salt gave 0.2318 grm. PbSO^. 

 V. 0.6455 grm. of the anhydrous salt gave 0.2425 grm. PbSO^. 



An analysis of the free acid gave a percentage of iodine somewhat 

 lower than the calculated value, but further study of it was prevented 

 by the closing of the summer term. 



