340 PROCEEDINGS OP THE AMERICAN ACADEMY. 



ties were determined volumetricallj. In all cases I took 1 c.c. of the 

 solvent in a test tube and ran in the solute from a burette till the solution 

 clouded. One can determine this point to 0.01 c.c. without difficulty. 

 In Table VIII. I give the solubilities at 20° expressed in cubic centi- 

 meters of solute in ten cubic centimeters of solvent. The solubilities 

 of ether and ethylacetate in water decrease with increasing tempera- 

 ture ; the solubilities of water in ether and ethylacetate increase with 

 increasing temperature. This behavior is well known for ether ; but 

 I have not found it stated anywhere for ethylacetate. 



It will be remembered that, when two liquids were practically non- 

 miscible, the series of saturated solutions formed by these with a con- 

 solute liquid were expressed by two curves of the same general form, 

 but having different constants ; and it was found that these two curves 

 represented, the one the sei-ies of solutions out of which liquid B is 

 precipitated on addition of either A or JB ; the other, the converse 

 series, when the solution was saturated in respect to A but sensitive to 

 an excess of either A or B. When the liquids A and B are partially 

 miscible, the case becomes apparently more complicated, for we have 

 four curves instead of two. These refer to four distinct sets of equi- 

 librium, there being the following four series of saturated solutions. 



1 . The solution is saturated in respect to B. Excess of A produces 

 no precipitate. 



2. The solution is saturated in respect to B. Excess of ^ or 5 

 produces a precipitate of B. 



3. The solution is saturated in respect to A. Excess of ^ or ^ 

 produces a precipitate of A. 



4. The solution is saturated in respect to A. Excess of B produces 

 no precipitate. 



Series 2 and 3 correspond to the two series observed with two non- 

 miscible liquids. In these two series the consolute liquid is the solvent, 

 whereas in series 1 and 4 we have, in addition, A and B respectively 



* Schuncke finds 1.04-5, Zeitschr. f. ph. Chem., XIV, 3.34. 1894. 



