1891.] 



On certain Ternary Alloys. 



185 



errors, more especially slight variations of temperature ; bat with im- 

 perfectly intermixed fluids differences of much greater magnitude 

 were often observed. 



Next we prepared a series of mixtures containing as nearly as 

 possible equal weights of water and chloroform with varying propor- 

 tions of acetic acid up to 50 per cent, of the last. This amount pro- 

 duced a single homogeneous fluid not separating into two liquids, 

 whereas with 45 per cent, separation readily occurred. The follow- 

 ing average numbers were obtained from about twenty experi- 

 ments : 



These figures clearly show the close analogy between mixtures of 

 iloroform, water, and acetic acid, and such ternary metallic mix- 

 res as lead-zinc-tin, bismuth-zinc-silver, &c. On plotting curves as 

 ith the alloys previously described, the following results are 

 jducible : 



1. Plotting percentages of acetic acid in one mixture (the lighter 



one, for example) as abscissas, and excesses of percentages of 

 acetic acid in top over those in bottom fluids as ordinates, the 

 curve indicated in fig. 4 is obtained, closely resembling in 

 general features those obtained with lead-zinc-silver and 

 bismuth-zinc-silver alloys, the curve ascending to a maximum 

 elevation and then coming partly down again, but not so much- 

 so as to descend again to the base line. 



2. Percentages of acetic acid in heavier liquids as abscissas, and 



those of water as ordinates. Curve shown in fig. 5, repre- 

 senting the solubility of water in chloroform in presence of acetic 

 acid. 



o 2 



