Mr Orange, On certain phenomena of the kathode region. 219 



the question is more complicated than at first sight appears. For 

 other reasons the experiment failed with regard to the primary 

 object, as will appear in the following account. 



Fig. 1. 

 Experiment I. 



The discharge vessel employed was of the form shown in Fig. 1. 

 It was in continuous connection with a Toepler pump to which the 

 usual phosphorus pentoxide bulb was attached. The gas used 

 was generally air* but for a special purpose hydrogen was introduced 



* At times apparatus was used in which many joints, made air-tight by the use 

 of sealing wax and varnish, occurred, and in consequence the gas was largely 

 carbon monoxide. 



