NOTES ON SCIENTIFIC RESEARCH. 147 
acids with higher m. p. being separated out. Such a result may be caused merely by 
a lowering of the temperature, or by the spontaneous conversions. 
From the dissimilarity of the solutions and fluxes, the existence of dissimilar 
solution- and flux-mixtures, and from the laws which govern the conversion of the 
systems from solid —> liquid, and from solid --> solid, it follows unequivocally that 
the allo- and the zsocinnamic acids are three bodies of chemically different character. 
The allo- and isocinnamic acids do not constitute three genera of a trimorphous cis- 
cinnamic acid; on the contrary, each of the three is in itself isomeric with ordinary 
cinnamic acid of m. p. 133°. 
It remains to be considered that the chemical difference of these four isomerides 
cannot be made clear by the usual stereo-chemical formule, seeing that, up to the 
present, only two symbols are available, namely: 
CeHs-C-H and Ce Hs-C-H 
HO,.C-C-H F-C-CO.H. 
Oxides. 
Cineol. I. Bellucci and L. Grassi‘) believe that in the present state of our know- 
ledge of the oxonium salts it is advisable to regard these substances as simple mole- 
cular additive: compounds. The authors have investigated the power of combination of 
a series of organic compounds with one single substance, paying special attention to 
the influence of position isomerism upon this property of combination. They selected 
cineol as an oxygenated compound because it exhibits a marked tendency to form 
additive compounds, because it is a good solvent for many bodies, and, finally, 
because its solidifying point (+ 1°) is specially suitable for thermic analyses. 
They were unable to examine the cineol-carvacrol system because the mixture 
refused to crystallise at a low temperature. They were unable to confirm by thermic 
analysis the existence of a combination of cineol and resorcinol, but thy were able 
_ to prove the existence of an additive compound with «- and @-naphthol. The com- 
pound with «-naphthol melts between 73 and 75°, that with $-naphthol between 
48 and 50°. Additive compounds were also obtained from one molecule of cineol 
with one molecule each of phenol (m.p.-+ 8°), o-cresol (m.p.50°), m-cresol (m. p. 
— 5°), p-cresol (m. p.1,5°), pyrocatechol (m. p. 39°), resorcinol (m. p.—15°), thymol 
(m. p.+4,5°), and from two molecules of cineol with one molecule of hydroquinone 
(m.p. 106,59). A compound with p-hydroxybenzoic acid appears to exist, but it is 
decomposed before melting. Cineol does not combine with o-, m- and p-nitrophenol; 
o- and m-amidophenol, o- and m-hydroxybenzoic acid and. with phenyl- and naphthyl- 
Salicylate. The results obtained appear to afford evidence against the theory of the 
oxonium salts and the basic character of the oxygen, because, although phenol is 
absorbed, the more strongly acid nitrophenols are not. 
Nitrogenous bodies. 
Alkylidene hydrazines. In continuation of his earlier investigations®), 
N. Kishner*), has described the conversion of the hydrazine compound of methyl- 
heptenone into 1,1-dimethylhexene-1 when heated with potassium hydroxide. The 
hydrocarbon boils at 122,4°: d®> 0,7254. The nitrosochloride melts between 48 and 51°. 
*) Gazz. chim. ital. 43 (1913), Il. 712; Chem. Zentralbl. 1914, 1. 884. — 2) Comp. Report April 1198, 152. — 
*) Journ. russ. phys. chem. Ges. 45 (1913), 973; Chem. Zentralbl. 1918, Il. 2132. 
10* 
