OP ARTS AND SCIENCES. 129 



I. 0.5972 grm. of the air-dried salt lost at 100° O.OIGI grm. II.p, 

 and gave by iguition with II^SO^ 0.2Go5 grm. PbSO^ . 



II. 1.0438 grm. substance dried over H^SO, lost at 100° 0.0283 grm. 



II.^O, and gave by Iguition with H^SO^ 0.4622 grm. PbSO^ . 



Calculated for Pb(CaIIBr..O.,)., . ILO. Found. 



I. II. 



Pb 30.31 30.37 30.25 



HP 2.64 2.70 2.71 



Calcic Dibromacrylate, Ca(C.jHBr.>02)., . 3H.,0. The calcium salt 

 made from the pure acid crystallized in long clustered needles, which 

 gave on analysis results identical with those which 0. R. Jackson and 

 I formerly obtained. 



I. 2.1502 grm. of the air-dried salt lost at 80-85° 0.2034 grm. 

 H.O. 

 IL 1.2264 grm. of the air-dried salt lost at 95-100° 0.1171 grm. 



up. 



III. 1.8124 grm. of the air-dried salt lost at 100° 0.1755 grm. Hp. 



Calculated for CalCgHBr.O.J . 3HoO. Found. 



I. II. III. 



Hp 9.78 9.46 9.55 9.68 



I. 0.4393 grm. of the salt dried at 100° gave on ignition with HgSO^ 

 0.1199 grm. CaSO, . 

 II. 0.6161 grm. of the salt dried at 100° gave on ignition with H.^SO^ 

 0.1674 grm. CaSO^ . 



Calculated for Ca(C3HBr202)2. Found. 



I. II. 



Ca 8.03 8.03 7.99 



Potassic Dibromacrylate, KC3HBr.p,,. The analysis of the potas- 

 sum salt made by neutralizing the pure acid with potassic carbonate 

 showed that it was anhydrous, as it had previously been described. 



I. 0.7334 grm. of the salt dried over HjSO^ gave on ignition with 

 11,80, 0.2373 grm. K,SO^. 

 II. 0.7507 grm. of the salt dried over H„S04 gave 0.2427 grm. 

 K,SO,. 



VOL. xvii. (n. S. IX.) 9 



