10 PROCEEDINGS OF THE AMERICAN ACADEMY. 



merite d'etre mentionee. Si la solution de chlorure de barium n'est 

 pas concentree les deux sels separent par le refroidissement ; le 

 chlorure de barium cristallise en tables, tandis que le protochlorure 

 d'antimoine decompose I'eau. II faut done pour obtenir cette com- 

 binaison, coucentrer la solution de chlorure de barium, avant d'y 

 ajouter le protochlorure d'antimoine. La liqueur donne alors des 

 aiguilles fines disposees en groupes ^toiles. Ce sel double est 

 compose de 



SbCls . 2 BaCl + 5 HO. 



Le protochlorure d'antimoine se combine egalement avec les chlo- 

 rures de stroutium, de calcium et de magnesium." 



SchiifFer, * in 1860, working on the double iodides of antimony and 

 the alkaline metals, described the double iodide of antimony and barium 

 as a yellow salt with a formula, 



2 Ba I . Sbis + 18 HO. 



Storer f gives a list of salts, viz. : — 



2 BaCl : SbClg + 5 Aq. 

 2 CaCl : SbCla + 5 Aq. 

 2 MgCl : SbCls + 5 Aq. 

 2 SrCl : SbClg + 5 Aq. 



Watts's Dictionary t gives the formula alone of a salt of this class, 

 i.e. 2 (BaClo.SbCla) 3 H2O. 



Graham-Otto § makes the simple statement that antimouious chloride 

 forms crystalline compounds with the chlorides of the alkaline and 

 earthy alkaline metals. 



Poggiale and Schiiffer, therefore, appear to be the only investiga- 

 tors wlio succeeded in obtaining compounds with the earthy alkaline 

 metals. 



Although we have obtained a great many beautifully crystalline 

 compounds from various mixtures of the haloids of antimony with the 

 haloids of calcium, magnesium, barium, and strontium, only three of 

 these have as yet been investigated. As has been before stated, cold 

 weather is an absolute essential in the formation of the compounds, 

 and the season is so far advanced that no more work can be done on 

 them this year. 



* Pogg. Ann., CIX. 611. J Edition of 1888, Vol. I. p. 287. 



t Dictionary of Solubilities, p. 149. § Michaelis edition, Vol. II. p. 555. 



