Proceedings of the Poltteceniv Association. 903 



Dr. Feuclitwanger remarked that there was no difference between 

 two pieces of sugar producing phosphorescence and two oyster shells 

 after exposure to a beam of the sunlight. 



Dr. L. Bradley said that near his house was an old decayed tree, 

 which he cut down and laid in the open air ; the weather was cloudy 

 for four days after, when a fine sunny afternoon followed, and after dark 

 that day all the wood seemed to be on fire. So, it seems, it requires 

 the sun's rays to produce this effect, as the phosphorescence was not 

 seen until the sun shone. The glow-worms will not shine unless they 

 have been exposed to the sun's beams for some time. 



Dr. Adolph Ott read the following paper : 



On the Inflammability of Petroleum and Schist Oils. 

 By Dr. Robert Peltzer. 



(Translated from Dingler's Polytechnic Journal, Vol. 189, page 61, by Dr.'AdoJpli Ott.) 



I have lately made experiments on the inflammability of different 

 products of distillation which were derived from Pennsylvania 

 petroleum and bituminous schists from Autun, Dept. Saone and 

 Loire in France. The same were conducted in the refinery of Messrs. 

 Cogniet, Marechal & Co., and made by the special request of M. 

 Cogniet. The following are the results of these experiments: 



