The following is a simple and infallible test to ascertain exactly the quality and explosive point of any sample of kerosene oil, no matter by what fancy, attractive name it may be designated in specious advertisements. Take a common tin pan of water, or an ordinary tin pail, say seven inches in diameter and five inches deep; fill the vessel with water and place it on the stove, or over a lamp, so as to heat very gradually; put an ordinary thermometer upright in the water, to indicate the gradual rise of temperature; take a little pan, such as is used to bake small parties, sold for one cent each; in the putty-pan put a tablospoonful of kerosene and let it float on the surface of tho gradually heating water.