Chemistry and Physics. 151 
analysis it gave the formula C,H, Br As it readily solidifies at 
17", it is thereby distinguished from acetylene tetrabromide, 
which remains liquid at —20°. From its reactions, the author 
“wise a large excess of hot hydrochloric acid ; 
the acid separates in crystals on cooling. From 
hours (when 330 grams of ene came over) and then for fourteen 
y increasing temperature (during which 
ae acid were obtained. The dicarbonic acid is best obtain 
Y using a mixture of three molecules of sodium-phenol and one of 
potassium-phenol, and heating to 320°: reason of its insolu- 
= heating, prove that the two carboxyls ceeney the ortho and 
st converted it 
Fittig.” The phenol-tricarbonic acid is therefore oxytrimesinic 
acid. No further introduction of carboxyl into phenol was pos- 
riers the meta derivatives not being obtainable in this way; a 
io, also of the nitro-derivatives.—/. pr. Ch., Tl, xv, 301, 
pril, 1877, ; PB 
6. On the Relation of Cystin to Sulphates in the Urine.—Ntx- 
MANN has examined a case of cystinurea and has sought to 
