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Chemistry and Physics. 69 
Ziirich, were used for the preparation of these products. The 
needles, in which the peculiar odor seemed to be most abundant, 
were stripped from the twigs and distilled with water in a large 
copper retort in a current of steam from a boiler. The distillate 
was agitated with ether and the ether distilled off. The early 
portions of the distillate gave only a solid residue, the next gave 
a mixture of solid and liquid, and the last portions only an oil. 
The solid substance was with some difficulty obtained crystallized. 
It is very soluble in alcohol, ether, benzene and chloroform, In 
ligroin (petroleum naphtha) it is less so. In glacial acetic acid, it 
is soluble only on heating. By covering its solution in this acid 
with a layer of: water, the gradual solution of the acid caused a 
deposition of this body in small crystal plates, fusing at 105°. 
concentrated, it recalls the odor of peppermint. Its boiling 
oint was between 290° and 300°, and it gave on analysis C 93°55, 
6°09, corresponding to the formula C,,H,,. Its vapor density 
liquid distillates gave: (1) a colorless oil boiling at 155°; Phe 
il fus- 
1 
given a summary of the processes discovered and patented by 
Bayer for the synthesis of indigotin. The point of departure in 
th of i i 
subseq ansform it into orthonitrophenylpropiolic 
acid, the orthonitrocinnamic acid is brominated, Aso 
(NO,)(C,H,Br,0;). By the action of alkali in boiling alcoholic 
hol, gives orthonitrophenylacrylic acid ©,H,(NO,)(C,H,O,). 
the action of heat alone orthonitrophenylacrylic acid is converted 
C,H,NO.=C,H,NO+CO,+H,0+0. 
The reaction takes place at 110° C. The mass swells, its color 
gradually darkens, and, treated with alcohol, it leaves a residue 
