2 IQ EDWARD DIVERS AND TAMEMASA HAGA . 



was the normal effect; but, after stirring well till the effervescence had 

 subsided, the solution began again to effervesce and to deposit, a basic 

 mercuric calcium salt, possibly analogous to the sodium salt and 



/NCSOsHgO^Hg 



therefore, Hg<^ 



' X N(S0 3 \,Ca 



When the effervescence had again subsided, the precipitate and mother- 

 liquor proved to be — the one, a mixture of calcium carbonate and 

 basic mercury calcium imidosulphonate, roughly separable by dilute 

 nitric acid; the other a solution of normal and two-thirds normal 

 ammonium imidosulphonate, with a very little mercury calcium 

 imidosulphonate, or the equivalent of these salts. Xo amidated 

 mercury salt was produced. 



Berglund also tried to make the mercury ammonium salt, but 

 without success, from the mercury barium salt and ammonium 

 sulphate. In this case, too, almost all the mercury was precipitated as 

 basic salt, and ammonium imidosulphonate left in solution. The salt 

 appears to be, therefore, incapable of continued existence. 



Mercury potassium imidosulphonate. — According to Berglund. 

 dilute nitric acid has no action upon this salt, but, as we have pointed 

 out, the acid converts it into the insoluble two-thirds normal potassium 

 salt and mercuric nitrate. 



Mercury sodium, imidosulphonate. — This salt was described by us 

 fully, under the belief that Berglund had not prepared it, in which we 

 were mistaken. We prepared it from mercuric nitrate with facility, 

 while he used the chloride, having found the nitrate to give a product 

 containing no sodium, probably because his solution was too acid or 

 added too freely. We found the water of crystallisation to be about 

 5| atoms and gave it as G atoms. Berglund found 5 atoms of water. 

 We have again prepared and examined the salt, and have now 

 got results in excellent agreement with 5H 2 0. Therefore, his formula 



