Proceedings of the Polytecexic Association. 1001 



terns, lined inside with iron, remained free from ozone, and conld be 

 completely bnrned. 



2. Photot^en and solar oil, kept in balloons of white glass, wrapped 

 up in straw, showed traces of ozone, bat bnrned well otherwise. 

 Both the color of the oil and that of the cork were found slightly 

 changed. 



3. Photogen and solar oil, in balloons of white glass, painted black, 

 showed traces of ozone. The oils were less changed than those noted 

 in number two. The corks were not bleached. 



4. Solar oil and photogen which had been kept in unwrapped white 

 glass balloons, were found to be strongly ozonized. Tliey burned 

 very badly, charred the wicks, and nearly extinguished the flame 

 after burning for six or eight liours. The solar oil was turned 

 strongly yellow, and showed an increase of 0.003 in its specific 

 gravity. 



5. Solar oil which had been exposed to the light in unwrapped 

 balloons of green glass gave strong indications of ozone. Though 

 the wick became charred, the oil burned quite well and was little 

 changed in color. 



6. Solar oil in balloons of green glass, painted black, was found to 

 contain some ozone, but it bnrned perfectly well. That in green 

 balloons, wrapped in straw, showed about the same results. 



T. American kerosene which had been exposed to light in balloons 

 of white glass became strongly ozonized, so much so that it scarcely 

 burned. The formerly bluish-white oil had assumed a vivid yellow 

 tint, and its specific gravity was found to have increased 0.005. 



8. American kerosene which had been kept in the dark for three 

 months did not show any ozone and burned perfectly. 



The oils had been exposed to light from April to July, 1868. 

 Those which had become strongly ozonized were changed in odor 

 also, and the corks had become bleached, as if attacked by chlorine, 

 while those in balloons, containing unaltered oils, were entirely 

 unchanged in that respect. 



After the discussion on the scientific items several new inventions 

 were exhibited. 



Xp:w Stove Pipe Joint. 

 Mr. Faint, of Canada, exhibited a stove pipe having a screw-thread 

 on the ends, similar to that of fruit jars, by which the ends of the 

 pipe can be screwed together, making a strong and tight joint. 



