Chemistry and Physics. 475 
Wishing to try this method with butyl alcohol, in order to 
obtain normal butylene, Lx Bet and Greene allowe d this alcohol 
C 
mixed with traces of OH Br CBr. 8 No ethyl-vinyl 
was formed in the reaction. Treated with sodium the reaction 
was violent, and the products collected in hydriodic acid yielded 
25 secondary butyl iodide, CH ,—CHI-~ CH, —CH,, thus prov- 
two normal butylenes, i. e., those in which the carbon atoms are 
united to no more than two others; one of these is ethyl- 
vinyl, CH,~CH, —CH=CH, vee the other dimethyl-ethylene 
CH, _CH=CH= ~CH ,. Upon e hypothesis. that in es 
with a hydracid, the hydrogen ov the haloid play the 
as the hydrogen in the saturated molecule and hence theta all the 
hydrogen atoms attached to the same carbon atom have the 
same value, both these bodies should yield the same hydriodate 
CH, —CH, —CHI—CH, ; while if the hydrogen of the HI hoe a 
different value, the two hydriodic compounds will be isomeric. 
Preparing carefully the two bodies the ey were found to be identical 
in properties, both boiling at 118°-121", and both yielding a buty- 
lene by the action of ete potash which gave a bromide dis- 
oo einer ee d 160°.—C. &., Ixxxvi, 488, Feb. ; spas 
Soe. Ch., Tl, xxix, 306, ‘Apri; 1878. 
jo Chemie al P-Composistin of Oil of Tansy and Oil of wale 
—Bruytants has submitted to proximate analysis the oils 
of cay and of valerian The former is a mobile yellow liquid, 
of sp. gr. 0°923 at 15°, begins to boil at 192° and distils Panel. 
between 194° and 207°, the thermometer rising finally to 270°-280 
leaving a resinous mass about a tenth of the whole. Treated 
to which the vapor roti 5°07 corresponds; it is thus an isomer 
urel cam re y t iw action mt the acu hydride 
ahead Ss a Ort s20 by abstraction of H,0, it gives 
eym roHdia, by action of —, chloride, tanacetene 
dichloride, "tanacetene mniancblotdenad cymene, and with ammo- 
