OP ARTS AND SCIENCES. 



145 



Calculated for C3H.2Cl2Br.2O2 



C 11.96 



H 0.67 



CI 23.59 



Br 53.15 



76.74 



This a dichlorclibrompropionic acid crystallizes in well-formed tri- 

 cliuic prisms, which melt at 94-95°, It is readily soluble in water, 

 alcohol, or ether ; in carbonic disulphide, chloroform, or benzol it dis- 

 solves less freely. From a solution in carbonic disulphide it could be 

 obtained by slow evaporation in well-formed crystals, whose study was 

 kindly undertaken by Dr. \V. H, Melville. 



CRrSTALLlNE FORM OF « DiCHLORDIBROJIPROPIONIC AciD. 

 00* 



0/0 



001 



Triclinic System. 



Forms, pOO} {010} {001} {101} {011} {lOT} {OTT} ; {110} 

 and ^ITO} often present. 



* Elements : Macrodiagonal a = 1 .023 



Brachydiagonal b = 1 



Vertical axis c = 1.052 



Angles of axes XY = 91° 



XZ = 76° 31 1' 

 YZ = 108° 52' 



* Through an error the ratios of the fundamental parameters were originally 

 given in the Berichte der deutsch. chem. Gesellsch. xiv. 1680. a : b : c = 

 1.034 : 1 : 1.062. 



VOL. XVII. (n. B. IX.) 10 



