OF ARTS AND SCIENCES. 337 



ammonium salt with baric chloride. It is rather sparingly soluble even 

 in hot water, and still less soluble in cold water. It separates from a 

 hot concentrated solution in fine clustered needles which contain three 

 molecules of water. The crystals are permanent in the air, but lose 

 their water readily at 100°. 



I. 1.2048 grm. air-dried salt lost at 100° 0.1170 grm. H 2 0. 

 II. 1.2118 grm. air-dried salt lost at 100° 0.1132 grm. H 2 0. 



III. 0.5694 grm. air-dried salt gave 0.2393 grm. BaS0 4 . 



IV. 0.3783 grm. air-dried salt gave 0.1593 grm. BaS0 4 . 



Calculated for Found. 



Ba(C 5 HCl 2 3 ) 2 . 3 H 2 0. I. II. IH. IV. 



H 2 9.80 9.71 9.34 



Ba 24.86 24.71 24.76 



I. 0.4828 grm. salt dried at 100° gave 0.2250 grm. BaSO v 

 II. 0.5540 grm. salt dried at 100° gave 0.2579 grm. BaS0 4 . 



Calculated for Found. 



Ba(C 5 HCl 2 O s ) 2 . I. II. 



Ba 27.56 ' 27.40 27.36 



The solubility of the salt in water at 19°.5 was determined accord- 

 ing to the method of V. Meyer. 



with the analytical data upon which they depend. The errors in the calculated 

 percentages are corrected in parenthesis. 



Barium salt : 

 0.4480 grm. of the salt lost at 110° 0.00204 grm. H 2 0. 



Calculated for 

 Ba(C 6 HCl 2 3 ) 2 . 3 H 2 0. Found. 



H. 2 9.80 8.30 (0.445) 



0.1939 grm. of the dry salt gave 0.0769 grm. BaS0 4 . 



Calculated for 



Ba(C 5 HCl,0 3 ) 2 . Found 



Ba 23.54 (27.56) 23.32 



Calcium salt: 

 0.6942 grm. of the salt lost at 110° 0.0300 grm. H 2 0. 



Calculated for 

 Ca(C 5 HClo0 3 ), . 3£ H 2 0. Found. 



H 2 13.60 14.45 (4.32) 



0.3024 grm. of the salt gave 0.1072 grm. CaS0 4 . 



Calculated for 



Ca(C 5 HCl 2 0,) 2 . Found. 



Ca 10.00 10-42 



These results can hardly be explained unless it is assumed that they con- 

 tain both typographical arid arithmetical errors. The two remaining analyses 

 contained in Denaro's paper, two chlorine determinations in the free acid are 

 correctly calculated, and agree well with the theory. 

 vol. xxiv. (n. s. xvi. ) 22 



