1908] CROCKER AND KNIGHT—CARNATIONS 273 
of the gas constituents with bromin) was separated, washed with a 
weak solution of potassium hydrate, and later with distilled water. 
This oil was then dried with fused calcium chlorid and later frac- 
tionated. In the first distillation all the portion boiling between 
129° and 134°C. was saved. This was later redistilled and the 
fraction boiling between 103° and 1 32° C. saved as representing the 
ethylene dibromid, since this compound boils at 131°C. About 
3 per cent. of the dried material absorbed by bromin boiled between 
30” and 132°C.; a small portion boiled at 129° C. or below. From 
this it rose up quickly to 131° C., where it again gave a considerable 
fraction. Then it rose rapidly to 139°C., where a considerable 
fraction distilled. In one trial, 208 liters of gas at 27° C. and under 
Pressure of 745.5™™ of mercury gave 1308 of dried oil; of this 
44.28 boiled between 130° and 132°C. After correcting for pres- 
sure and temperature the following equation equals the percentage 
volume of gas that is ethylene: 
22.4% 760X 44.2 X 300 
208 X745:5 X178X273 
In a second determination 1 38 liters of gas at 27° C. and 745.5™ 
org Save 31.68" of oil boiling between 130° and 132°. Cor- 
the ing for temperature and pressure, the following equation gives 
percentage volume of ethylene in this case: 
22.4X 760X 31.6300 
138X745 ..4X178X273 
F = mst be stated, however, that according to WINKLER (17) the 
aes of ethylene by bromin is not complete, and farther that 
ing oe ethylene dibromid is necessarily lost in washing, dry- 
hishar pa distilling, ~~ that the percentage is probably considerably 
of other 7a obtained. It must be urged also that the presence 
broméd 3 with boiling points rather near that of the ethylene 
nds to make this fractionation less accurate. 
=2.9-+ per cent. 
=3.2 per cent. 
4. General 
_ of great interest to know that the most delicate chemical test 
oan: gas in the atmosphere falls far short of detecting 
tests f that work havoc with the flowers of the carnation. The 
°F carbon monoxid are those used for detecting illuminating 
