g^ DIVEKS A^"D H AG A. 



The barium and .sodium were determined by caiitioiis ignition of the 

 silt alone, then with «ul[)huric acid, and l)oiling out with water. The 

 residue was weighed as barium sulphate, and the soluble inatter after 

 re-io"nition weighed as sodium sulphate. The sodium of d was lost. 



O c5 J- 



The sulphur was estimated l3y hydrolysis followed by precipitation with 

 barium chloride, but the barium sulphate was here weighed in two 

 quantities, that formed by hydrolysis and that l)y the barium chloride. 



Calcium iiuidustdpli ouates, simple and doidile. 



Normal ealciiiiii imldosidphoiiate, C-dJs.^Q^O-^i, is not forjned by 

 reaction between sodium or ammonium imidosul})honate and calcium 

 chloride. When a sc^lution of diammonium imidosulphoijate is treated 

 with pure, soft, calcium hydroxide in the calculated quantity, am- 

 monia is at once liberated and is all expelled by two or three eva}'ora- 

 tioiis of the solution to dryness. The siüt left dissolves and forms 

 concentrated solutions crystallising in transparent prisms. J]ut 

 although the salt dissolves at first freely, the last ])ortions are more 

 difficult to bring into soluti(3n, and it may be that water partly de- 

 composes the salt into the calcium hydrogen salt and calcium 

 hydroxide. The salt was not analysed, except that a calciLun deter- 

 mination was made, according to wdiich the crystals would have ten 

 molecules of w^ater to two atoms (jf nitrogen in the salt. 



Calcium liijdroijen Imidosidplioiiate is obtained in radiating groups 

 of fine needles when diammonium imidosulphonate and the calculated 

 (piantity of calcium hydroxide are mixed, and the solution repeatedly 

 evaporated to expel all ammonia. The calcium hydroxide dissolves 

 quickly after it is added. The salt is soluble and has not been 

 analysed. 



Calcium ammonii(iii imidosulphonate is a sparingly -soluble salt 

 obtained wlien the calculated quantity of calcium hydroxide is dissolved 



