OF ARTS AND SCIENCES. 261 



of the ester. The behavior of such a solution made by using an ex- 

 cess of the ester with amnionic hydrate was studied nevertheless, and 

 the following are the more characteristic precipitates which were 

 obtained : — 



Magnesium salt, pale rust-colored. 



Calcium salt, pale red flocks. 



Strontium salt, like that obtained from calcium, but not so heavy a 

 precipitate. 



Barium salt, an even less heavy precipitate than that obtained with 

 strontium, also less flocculent. 



Manganese salt, yellowish brown. 



Zinc salt, pale red. 



Cobalt or Nickel salts, yellowish. 



Ferric salt, rust-colored. 



Capric salt, a rusty red to orange. 



Mercuric chloride, yellowish brown. 



Mercuric nitrate, rust-colored. 



Mercurous salt, rusty precipitate mixed with the black product from 

 the excess of amnionic hydrate. 



Cadmium salt, yellowish red. 



Lead salt, brilliant rust-color. 



Silver salt, vivid brown (" Bismarck brown"). 



The most characteristic point in its behavior with reagents is that 

 the magnesium and calcium salts are less soluble than the strontium 

 and barium salts, the order of solubility being magnesium and calcium 

 least soluble, strontium more soluble, barium the most soluble. A 

 similar observation has been made by Bischoff * in regard to the salts 

 of orthonitrobenzoylmalonic ester, and the bromdinitrophenylacetacetic 

 ester also exhibits the same peculiarity, as we mention in detail in the 

 next paper of this series. 



Salts of Bromtrinitmphenylmalonic Ester. 



"We had intended at first to make a ra;her thorough study of the 

 salts of the bromtrinitrophenylmalonic ester, but after a few experi- 

 ments became convinced that this would be a waste of time, as, owing 

 to the ease with which the atom of bromine can be removed, no very 

 satisfactory analytical results could be obtained ; and we were the 

 more ready to give up this part of the work, because our investigation 

 of the secondary oily product of the reaction, by which the bromtrini- 



* Ann. Chem., ccli. 3G2. 



