Chemistry. 195 
prosecuted the subject to a greater length, and obtained several 
interesting results; When one of his tubes, containing water and 
a little sulphuret of carbon was heated, the water became at first 
milky, then transparent, with a slight green tinge, and after- 
wards almost black by increasing the temperature. The sul- 
phuret of carbon became lighter than the water during the ex- 
periment, and floated on it some time before it became all var 
pour. '-As the tube cooled, the green colour diminished, and the 
fluids took their first state, the water having a yellowish tinge. 
When a little chlorate of potash was put into the tube along 
with the above fluids, the heat first dissolved the salt ; but upon 
cooling, the water became milky, and the floating sulphuret of 
carbon fell to the bottom with the crystallizing salt. At a higher 
heat, the liquor became suddenly of a pure lemon-yellow colour, 
accompanied with effervescence, and the formation of an oily-look- 
ing globule ; which, on cooling, remained liquid at the bottom of 
the tube, without any crystals being formed. With a still higher 
heat, the yellow liquid disappeared, and was replaced by a small 
globule of liquid sulphur, which, by additional heat, assumed 
the colour and transparency of ruby, but resumed the appear- 
ance of sulphur by cooling. No trace of sulphuret of carbon 
appeared in the tube, excepting that, at a certain heat, the water 
became bluish, though it was always colourless when cold. This 
coloration did not appear in another tube, where the proportion 
of chlorate of potash was greater. Small acicular crystals some- 
times formed in these tubes in groups of five or six about a central 
point; and once the whole mass was crystallized. When the water 
was alone, the transparency of he glass was always affected, 
but never along Avith other substances. The sulphuret of carbon 
goes into vapour at 220° of Reaumur, the proportion of fluid to 
, the contents of the tube being as 8 to 20. It then exerts a pres- 
sure of 77.8 atmospheres, the pressure gradually increasing with 
the heat both below and above 220°. The following results 
were obtained with Ether, when the volume of liquid was 7, and 
that of the tube 20. 
