352 
DR, MEYER WILDERMAN ON CHEMICAL DYNAMICS 
the acetylene gas in the gas-holder, still the mixture is undoubtedly a source of error, 
and special precautions have to be taken to remove the first portion of the acetylene 
formed from the container, so as to keep the composition of the gas during the 
experiments as constant as possible. Secondly, the pressure of the gas from such a 
Sketch of Acetylene Burner and Purifier, Thermopile, Reaction Vessel, Bath, Water Manometer, and 
Cathetometer.—A.B., acetylene burner; P, purifier; R.Th., Rubens thermopile; B, bath; R.V., 
reaction vessel; M, mercury manometer of reaction vessel; Cat., cathetometer; W.M., water 
manometer. 
generator varies very considerably in comparison with that supplied from large gas¬ 
holders. The generator used was the so-called “ Incanto,” by Messrs. Thorn and 
Hoddle, with variations of 10 per cent, in the pressure of the gas delivered. This 
variation in pressure was found to he due to the strain of the floating halls on the 
