Chemistry and Physics. 453 
ndensing in fine white needles. By keepin 
cally sealed tubes, it changes toa yellow liquid, possibly its isomer 
above given. ith CS,, it evolves COCI,— Ber. Berl. m. 
Ges., vi, 996, Sept. 
h 
derived from  iodopropionic acid, though also different from 
i This latter acid was first 
strongly acid nor evolved acid vapors, the d : 
tracted with boiling 95 per cent alcohol, which dissolved it almost 
completely, leaving a small residue of sodium dipimalate, acrylate, 
and dihydracrylate. This solution on cooling deposited crystals 
of sodium hydracrylate, which were purified by recrystallization 
ese 
formula C,H,NaO,; they are very deliquescent, and melt with- 
out loss at 142°-143°. Heated to 300°, they lose a molecule of 
acryla i 
sevenerats the hydracrylate. The calcium, the zinc, the zinc-cal- 
cium and the silver salts of this acid 
scribed, The latter on heating yields acrylic acid, and not a 
trace of lactide. On oxidation, hydracrylic acid yields neither 
a) 
verted it into carbonic, formic and oxalic acids. Silver oxide gave 
once carbace-toxylie acid, but generally oxalic and glycollic acids. 
Melted potassium hydrate produced formic, acetic, oxalic and gly- 
collic acids, Heated with iodhydric avid in closed tubes, f iodo- 
