Smith.] 4:0 J ^^^^^ 18_ 



2. Six determinations were made with a solution containing 2. 1490 grms. 



borax in 250 c.c. water. 



Found 36.40% B.fi^, instead of 36.64%. 



3. With a solution containing .0865 grms. of borax, I obtained 86.89% 



B2O3. 



4. .0254 grms. borax, dissolved in water and titrated, showed 86.46% 



B2O3, instead of 36.64%. 



5. .0104 grms. borax gave 37.50% B2O3. 



6. .0198 grms. borax, titrated as before, gave 36.35% BjOj. 



A number of determinations showed that sodium salicylate can also be 

 advantageously employed as an indicator. 



For rapid work, where approximate results are sufficient, the foregoing 

 methods will no doubt be of service. Free acids should always be avoided. 



I have also experimented with tuogstic and molybdic acids in the same 

 manner, and while the results are very promising, I prefer reserving an 

 account of the same until the details have been fully worked out. 



III. Dihalogen Derivatives of Salicylic Acid. By W. S. Uoskinson. 



In the American Chemical Journal, Vol. viii, No. 2, Smith and Knerr 

 described metachloriodosalicylic acid and* its derivatives. Pursuing a 

 somewhat similar line of research, I prepared a brom chlor acid, and 

 an iodo-brom -salicylic acid, as well as derivatives of the same. Below 

 I give a brief description of these new compounds. 



Bromclilor-salicylic Acid. 



CgH^ OH BrCl COOH. 



To obtain this acid I used a definite quantity of metachlorsalicylic acid 

 (m.p. 172° C), and dissolved the same in alcohol. To this solution was 

 gradually added a corresponding, equivalent amount of bromine ; the 

 flask in which the reaction was performed was kept cool. When the 

 entire quantity of bromine was added, the alcoholic solution was evapo- 

 rated to dryness upon a water-bath. The residue was boiled with water 

 and barium carbonate, the liquid filtered and allowed to cool. The barium 

 salt separated in bushy needles. Its solubility in water is about 1 : 100. 

 The sodium salt was prepared from the barium salt, and from it the acid 

 was liberated by hydrochloric acid. The free acid forms small, white 

 needles, nearly insoluble in boiling water, but soluble in alcohol. In its 

 pure state it melts constantly at 229° C. 



The barium salt [(CgH, OH BrCl CO)^ Ba + 4HjO] forms long bushy 

 needles, soluble with difficulty in boiling water. An analysis of it gave 

 10.02% HjOand 21.20% Ba. The formula given requires 10.14% HjO and 

 21.48% Ba. 



The sodium salt (CgH^ OH BrCl COONa + 1^ H^O) appears in beau- 

 tiful bunches of white needles, which are very soluble in water. An 



