1555 
February 1916. The acid then extracted from the solution with ether 
still had — without any purification — the same melting point. 
The remaining aqueous liquid yielded, after careful evaporation 
in vacuum, no residue. 
3. Glutaconic acid was dissolved in as little dry ether as possible. 
To this solution was added so much pure chloroform that no erys- 
tallisation took place as yet, and a trace of bromine. Also here no 
change had occurred after 14 days exposure to sunlight. 
The two last experiments are still being continued. 
4. 1.5 gram of acid, dissolved in 15 ce. of water was illuminated 
in a quartz testtube for a month in front of the quartz-lamp. 
The liquid slowly turned red; this coloration persisted even after 
removal from the vicinity of the quartz-lamp. Elimination of carbon 
dioxide did not take place during the exposure to light. The acid 
extracted with ether after the iliumination proved on investigation 
to be unchanged, whilst the aqueous solution did not contain any 
residue. Hence, no g-oxyglutarie acid had formed. 
5. The resistance of a glutaconic acid solution contained in a 
conductivity-vessel was determined at 34°.5—34°.52; this was 
967.9 £2. Then the quartz-lamp standing just in front of the 
glass wall of the thermostat was lighted and during the radiation 
the resistance of the solution was continually controlled. The results 
were as follows : 
0 : 967.9 2 after 94’ : 971.2 @ 
after 41’ : 967.9 141” = 971.2 
60’ : 967.9 160’ : 973.6 
74’ : 969.6 UO TRO 
The change of the resistance is only + 0.6°/, and in a direction 
contrary to what might have been expected ; it must, therefore be 
attributed to external circumstances. 
The prediction made in the introduction that glutaconie acid would 
behave indifferently towards the transformation methods of the cis- 
transisomeric acids is thus perfectly justitied by the facts. 
c. Some reactions of glutaconic acid. 
1. Brutmann') has carefully studied the behaviour of a 
number of unsaturated acids towards mercuric oxide or acetate. He 
came to the conclusion that of each pair of cis-transisomerides, the 
stable (trans) acid gave a normal mercury salt (for instance cinnamic, 
fumarie, mesaconie acid) whereas the labile (cis) acids caused the 
1) Ber. 35, 2571 (1902); 48, 573 (1910). 
