4-NITRO-5-METHYL-2-SULPHOBENZOIC ACID 
191 
.2100 g. silver salt gave .0647 g. silver. 
Theory for CgHsOsNzS.Ag Found 
Silver, 30.92 per cent. 30.81 per cent. 
Potassium Salt of the Cyan Acid. 
(I 
NO, • CHs • CeH, • CN • sbsK 
The potassium salt of the cyan acid was made by dissolving two . 
grams of the ammonium salt in thirty-five cubic centimeters ot 
^vater, and adding while hot one gram of potassium carbonate in 
ten cubic centimeters of water. The solution was boiled to drive 
off the ammonia at least partly, and then allowed to cool. The 
potassium salt crystallized out in clustered crystalline plates 
similar to figure 8, or sometimes in pairs resembling figure 9. 
The salt was recrystallized from pure water. Its solubility is 
greater than that of the corresponding potassium salt of the 
imide. The taste is bitter in a degree corresponding to that of 
others of these compounds. The salt contained no water of 
crystallization. Potassium was determined as the sulphate. 
.1509 g. substance gave .0472 grams potassium sulphate. 
Theory for CsHgOsNaS K , Found 
Potassium, 13.96 per cent. 14.03 per cent. 
DERIVATIVES OBTAINED BY THE ACTION OF ANILINE ON THE 
ACID CHLORIDES. 
A. From the Symmetrical Chloride . — The formation of the 
anilids of the acid chlorides by previous experimenters in this 
field has been carried out in three ways: first, by the treat- 
ment of the solid acid chloride with aniline ; second, by the treat- 
ment of the acid chloride with aniline in ether or chloroform 
solution ; and third, by the action of aniline on the acid chloride 
in the presence of water. The first method has been found 
